The Omnipod adhesive, honestly, is hit and miss depending upon what activity you're doing and, probably, how many gremlins live in your closet.
If I even suspect I'm going to have an issue with the adhesive for any reason, I'll use either KT (Kineseo) tape or Opsite Flexifit to reinforce the adhesive. The adhesive is actually designed to allow the pod to move and conform to different parts of the body but, sometimes, it's just better to tape the thing down.
The nice part is that I can tailor the amount of adhesive to my needs. If I;m doing full live training in Jiujitsu, I'll tape it down with KT, Opsite, and some type of glue on adhesive. If I'm running, I might put a couple of strips of opsite to keep the pod stable. If I'm going to be in water for a long period of time, I'll put a couple of strips of Opsite on, just in case.
The bottom line is that the function of the pod is not dependent on the capability of Insulet's one size fits as many as possible adhesive. As long as the cannula is kept stable and secure at the absorbtion site, you're free to use as much or as little reinforcement on the pod itself, using whatever gets the job done, to fit your personal needs. At one point, I was snipping away the Omnipod adhesive, after insertion on-site, because it was just more stable to use that extra few square centimeters for more KT Tape.
Also, at one point, I was having issues with the pod coming off when wet, but that was after two workouts and three showers with the same pod on, after about a day and a half of wear. The adhesive can only take so much abuse. A few strips of Opsite took care of that problem on the rare occasions where it occurred. I've knocked the pod half off, with practically the cannula being the only thing keeping the pod on, and still saved the pod with a few strips of Opsite.
If you like the features of the Omnipod, there are solutions to most of the typical issues that commonly occur if you are willing to explore some options. The way I looked at it was that I got the pod in the first place because of all the features I liked, like being able to walk into the shower without having to either worry about disconnecting my tubed pump, or dealing with the entire apparatus while I'm showering.
I like the idea of being able to leave the PDM somewhere safe while a disposable pod is still delivering my basal for full coverage at all times. I don;t ever recall worrying about whether or not I needed to take my cell phone into the shower or pool because it isn't waterproof either.
If you don't like the features that make an Omnipod and Omnipod and can find more suitable features in another pump then, by all means, weigh your options.
If you're, instead, worried about the features of the Omnipod you like, somehow, not working, I wouldn't worry about that unless you actually find out for yourself that they do not work for you.