I'd been looking for a reasonably priced but good quality set of IEMs as an introduction to IEMs so I figured these fit the requirements. I tried them for the first time lastnight at a small show (~300 people) in a smallish room with a 6 piece band. My intention was to give them a try during soundcheck and switch back over to my usual floor monitor, they sounded so well in soundcheck that I used them for the whole show.
Isolation wasn't 100% but I don't think I'd have liked it to have been either so I could still get a feel for the stage. My stage position (keys) is beside the bass cabs so that still came through as well. When I say that the isolation wasn't 100% it was still fairly good at filtering out a LOT of the ambient noise, when I popped them out at the end of the show for the walk off the crowd noise caught me by surprise!
In conclusion, these IEMs are perfect to give it a try, they're not the expensive custom fit, multi-driver, fancy model so you shouldn't expect them to be but I'd definitely recommend them. Given the positive experience, I intend to keep using these and won't be looking to upgrade any time soon.