I love this adhesive patch! It sticks well and lasts a week. Like a lot of things in life, there is room for improvement. My recommendation would be to increase the opening about 1mm on all four sides. It would keep the patch from getting stuck on the Dexcom sensor and would make it a tad bit easier to apply without it getting stuck to itself when you need to unstick it from the side of the sensor. Never the less, I will be ordering more when I get close to running out.

UPDATE 12/29/2017: I still love this patch! Sorry for the picture of my big old belly! I put a new DexG5 sensor and Simpatch on. But I wanted to include a little bit of the other location I apply these (I alternate each week). The opening is a wee tad bit too small to fit over the G5 sensor. But with a bit of trial and error I think I found the best way and the correct amount to make the opening just wide enough to get it to fit.

The Simpatch does indeed last one week. But it does peel away on the edges a bit. It may be that adhesives don't do so well with my skin. Whereas adhesives work better with others. So, with the current one that I have on I put some Skin-Tac on first and let it dry until it was tacky. However.... I did NOT put it on under the Dexcom sensor's adhesive. I put it around the sensor, being careful not to touch the sensor's adhesive. Then I applied the Simpatch. I will try to remember to report back next week.

To James Duffy, founder of Simpatch, our son Vincenzo is a 4 year old type 1 diabetic. He recently started using the Dexcom Glucose Meter. We have to trim the simpatch to fit around the site, but it works great. Vin goes swimming once a week and gets a bath every night and the Simpatch is still intact a week later! He also loves the color blue. We let him pick the color to help create a smooth process when we have to remove the sensor each week and replace it to a different location on his tummy. We use adhesive remover pads to help get the Simpatch off and it comes off smoothly. Great product! I would recommend it to others! We hope to see more colors and maybe even fun designs. Thank you, Nick and Lisa Campbell

Let me preface this by saying I have adhesive sensitive skin- so it really wasn't a surprise that these didn't work for me on that front.
I was hoping that I wouldn't react to these but I do- pretty severely. After they are on for a couple of hours I have a big welt that ultimately shortens the time I can have the sensor in that site. Boo. I have heard you can use a skin prep to help with the reactions- so may try that.
I will keep them for emergencies- my DEX started popping out at work- and I was glad to have a quick fix to get me thru the day.

So sadly these didn't work for me. I also inadvertently ordered blue- which really shows thru clothes. My bad.
My Experience:
Stuck really well- no peeling issues- as a female- these are a bit big for some spots and I had to cut them down a bit. For an adult male I imagine this isn't a problem.
Very thick material- which for me was uncomfortable if I had it in a spot wear the skin folded ie abdomen.
I also found that they trap enough water between the simpatch material and the DEX material to take a long time to dry after showering- and causing the DEX to release from my skin. ( I put these on top of DEX not under as I have seen others do)
I found that tearing across the perforated line (not picking or trying to peel) the adhesive backing offer made removal of the backing paper much easier- and only peeling off one half before applying made it less likely to ruin the whole thing- especially when applying in a tricky hard to reach spot.
Customer Service sent me an email after my order: I responded letting them know I was having problems- and would likely have to return. They offered to replace at no cost- or I could return at no cost. I appreciated their speedy and courteous attempt at resolution.
Good luck - I hope these work for you!

This product is wonderful!! I waited to post a review until after I had a couple of test runs. I was able to wear my dexcom for up to 3 weeks!! I also let a friend try one. She had just applied her dexcom & the adhesive supplied w/it was already peeling off. We were @ a camp & it was HOT!! I showed her how to use it (very easy to use!) & she was able to keep her dexcom in place the entire week! The temps were in the high 80's w/very high humidity. She went swimming & also participated in multiple outdoor activities which made her sweat a lot. The simpatch never let go!! She & I both have very sensitive skin. Neither of us had any issues w/irritation from using this. I will DEFINITELY be purchasing this again & highly recommend it!!

Great adhesive and kept my sons Dex intact after a full day of swimming when everything else we've tried hasn't.