I can't really compare to underworks. I might have a used one, but it isn't labeled so I have no idea what it is. The used binder I have is VERY hot material. This appears like it could breath. I have worn it when it was 70 degrees with a long sleeve shirt and it wasn't bad. Of course this is not our summer. Not sure I like the concept of compression on the stomach. It doesn't compress as much but I don't know if I like somethign on my stomach like this. It does a very good job of binding, and is not uncomfortable to wear (except maybe not liking this stomach compression). I think it wouldn't be too bad cutting into. I actually cut under the arms. I don't like that it comes close under my arms. I asked about this. They told me that they had experimented with different openings. If there is too little it hurts and too much it will pinch. They won't honor a guarantee obviously, but it just looks like the kind of thing that wouldn't fray much. But obviously I just got it.
This isn't perfect for me. They told me that they are going to let me test their next model, since I wasn't completely happy. I thought that was pretty cool.
--Jay J