Update: The ReShow sellers have got in touch with me regarding the earlier review, stating that they were sorry for the delay in attempting to remedy the situation and provided a new, improved version of the adapter, so I will provide a new review based on that. First, I appreciated the response, as it was not expected. It was very nice, came with a 2 page hand written letter (or the best fake font I have ever seen which I doubt given paper marks) and I enjoyed the chinese folding solid screen a lot. Second, onto the new adapter. So I noticed the aux connector is now a more generic, black section, devoid of the old silver shaped one with "ReShow" written on it. It does appear to hold a better connection overall, although only slightly and I did still have issues fully getting bass to work correctly, playing with the end, like last time, somewhat fixes it. Not to even mention the horrible white noise you will get at all volumes, getting worse with higher volume. Unfortunately I couldnt stand the issues anymore and actually bought a aftermarket headunit. I appreciate the customer service trying to improve and fix the issue however.

So the first test was amazing for a couple of minutes, not moving, etc. Drive the car the following day.. and its cutting in and out here and there and activating google assistant, and sometimes producing a high pitch noise. Now its constant for the 3 or 4 times ive used it, cutting in and out and producing horrible sound quality. Playing with the aux end produces mixed results, sometimes fixing it for a few moments, othertimes completely screwing it up. I will have to purchase a better quality one sadly, avoid this however.

It worked for playing audio via my phone in my dated car. Not the best sound quality and died after a couple of years.

WORTH THE MONEY. GREAT WHEN YOU HAVE AN OLD VEHICLE AND NEED A AUX CABLE!

Bought this for my boombox, as it doesn't have an audio input. It only plays out of one speaker as the head doesn't align properly. For this purpose, it is a waste of money.

Update: Since my last review, Reshow has sent me an updated version of their adapter, so I tested the new product in several cassette players as well as a car stereo. Results were lacking in the home decks, and my pioneer deck refused to recognize that it was there and didn't play for more than a few seconds. However, tests in other decks mainly came down to the wire itself, it would jam in the door, which would keep the heads out of line, making the sound stronger in one speaker than the other. That problem, however, is much less present in the new version, but I still wouldn't use this in a home deck.
I later tested the adapter in my JVC car stereo, and it worked much better. I compared a song by Anders Enger Jenson on a real cassette to the same song on this device. The adapter had sharper trebles than the type 1 cassette, which is to be expected, but otherwise the two sounded very similar. I could only really test one of the stereo channels (I think my player is broken slightly), but I could hear much more from the other channel on the adapter than on the original cassette. I'm not sure if this is a mono device or if the heads were misaligned with the adapter as they were with my home decks, but what I could hear had pretty good sound quality (picture of my setup to give you an idea of how I tested the device).
Overall, my original review was for a purpose this product was not necessarily designed for. Don't use this for your home or personal decks, but for a car stereo it is acceptable. If I find a better way to test this product I will, but for now it gets four stars.

Update 2: Tested this product further in my boombox, and it is definitely in stereo. It also lines up well with the play head inside, despite the wire sticking out of the door. It sounds great with little noise from the gears to top it off. This product gets five stars, and I would recommend it to someone looking to add an aux plug to their car or boombox but not for a quality home deck.

I only removed one star because I have one of these made by philips that I used for probably 2 or 3 years and it still looks newer than this one I just bought. 2 of the screws on this had rust, and the head for reading to the tape deck had part of the black marking worn off and all the metal in general looked like it had been rubbed on for like ten times as many years as my already used one. It looked extremely well used/refurbished. I was not really expecting it to work due to it's condition, but once I turned the cord so it could fit in my deck and plugged it in, it turned out the sound quality was actually very good. I don't believe it plays in stereo, so you lose some of that experience. But I don't have to turn the stereo's speakers up all the way to hear it like some of the cheaper ones, there is really not that much static at all, and the build of the auxiliary connector looks pretty durable. It's annoying when the wires come loose there. Just be careful if you have to flip your cord too; only remove the bottom two screws and carefully lift the panel just enough to tuck the wire in it's spot. If you remove all the screws and a whole side it takes much longer to get all the parts that come loose back together.

Edit: I changed my rating from 4 stars to 5. I've been using it for a couple months now and it works excellent. I don't care about the look of the metal so much I guess. Also, the seller went out of their way to send a very considerate letter concerning the purchase and wanting me to be happy, and they included an 18k gold plated leaf bookmark that was probably worth as much as the adapter lol. Kind of weirdly generous and way overly concerned about the customers satisfaction. Interesting company.