The work great for my Dexcom G5! Things stay put like they should for up to two weeks.

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 awesome!

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

So far, we are happy with our purchase! They seem to stay on the best, from
the products we have tried since my son's relatively recent diabetes
diagnosis in December. They are much stickier than anything we have used in
the past few months. My son is a very active 12 year old who plays hockey
and football and also attends strength/agility classes at our gym. The
Simpatch has been able to stay in place, without the edges curling down,
with all of the sweat, showers, and swimming (we have a pool).

Here is my suggestion. Being a slim, fit, active child means that my son
doesn't have much skin real estate to work with. I wish you made smaller
sizes so the skin has less of an opportunity to become irritated after
being covered with the patch. He also uses it over his pump site, this area
would especially benefit from a smaller size patch since the cannula is
quite a bit smaller than the CGM site. We rotate his sites constantly but
there is an over lap.I have tried cutting them down (my Doctor's
recommendation) but it doesn't work as well for me to get the clean edge.