I've used a number of Wasabi batteries for my electronics, and have been happy with them especially since they cost about half of the price of the OEM battery. But these NP-BX1 batteries are the first ones I've received from Wasabi, that don't come in a plastic case. That's important to protect the contacts and this lack of a case is VERY disappointing. I will be very careful when ordering any more Wasabi batteries if i have to add the cost of a battery pouch to the order..

I just purchased the batteries and charger for my Sony HX 300 camera. They work great. Two matters might confuse you. 1.) The charger only takes one battery at a time. 2.) The graphics on the outside of the battery might confuse you. They are oriented differently from the graphics on the Sony original battery. When I inserted the battery, I matched the large arrow on the side of the battery to be oriented the same as on the Sony original battery. When inserted that way, the battery did not go in all the way and did not work. I discovered that the key is to make the small arrow on the end of the battery go the same direction as on the Sony original battery. Or, put differently, make the small arrow agree with the small arrow inside the camera. This means that the large arrow will be oriented differently than on the Sony original. I almost returned the batteries because of my initial misunderstanding. Wasabi would do well to reorient the graphics to make them agree with the Sony original.

Much lower capacity than the original batteries, which is quite disappointing as they don't just claim to match the original batteries, but claim to be 30% more capacity. The first giveaway is that the battery weighs less:
Sony OEM NP-BX1: 24.6g
Wasabi 1st battery: 20.9g
Wasabi 2nd battery: 20.6g

I have a battery tester that will measure the capacity of batteries (first you fully charge the battery, then connect it to the tester, and it runs them down and measures how much output they give before dropping below a set voltage, I discharged the batteries at 1A, with cutoff voltage set at 3.0V. Setting a lower discharge rate or lower cutoff voltage would allow to squeeze a bit more power out of the batteries, but take much longer. As long as I used the same settings on all batteries, they can be compared directly against each other)
Sony OEM NP-BX1: 1180 mAh (95% of rated 1240mAh)
Wasabi 1st battery: 840 mAh (53% of rated 1600mAh)
Wasaby 2nd battery: 835 mAh (52% of rated 1600mAh)

So even though these batteries claim to be 30% bigger than the original batteries, they are actually 30% smaller! There should be a law against this sort of thing but unfortunately almost every 3rd party battery supplier lies about their capacity from what I've seen. In terms of price per capacity, these are still a way better deal than the original batteries (2 batteries and a charger for $18 vs one battery for $30), but just be aware they wont last as long so you will need to carry more of them around.

These batteries are junk and it really shows during 4k recording. The rx100 would turn off after 2 minutes of recording due to low battery with these. I let it sit for a while, (30 seconds) turn it back on and view videos and adjust menu and the battery shows 75% full again.

The OEM battery lasts much much longer although it supposedly has lower specs.

Do not get these batteries.

edite 11/20/16: Ive added a video of the battery life..

It is hard to argue at this price because you get two batteries and a spare charger. The first of my two batteries failed to hold charge around the 10 month point. It had been used modestly and cycled about 8 times during that period. I was worried about the second one because it wasn't getting any maintenance top-offs during these months but it seems to work. I can't easily tell how much capacity is left but I'll report back if it is unreasonable or fails after only a few cycles.