If you never used in-ear, which I had not until I got these, you should realy try it out. I will never go back to a monitor. I use these mainly with an e-drum kit and find it works great. One big reason for trying in-ear to start with, is that in one band I play all songs to a click track and have to use headphones. They just don´t look alright on stage and a lot don´t cancel noise well enough. You will not have any problems with that with these. Like regular industrial ear plugs these make you not hear what other people are saying but you also talk VERY LOAD :) The sound is great, for being a small unit. Of course bass is not gonna be at par with a nice set of headphones but there´s definitly enough for a pleasant sound. I can turn down the volume a lot because the noice cancellation is so good. So not as much ringing in my ears at the end of the gig, which to me is one of the biggest advantages with in-ear. I was worried that I would have a hard time getting a proper fit, and at the first and second gig I was struggling a bit. But after a few tries they sit perfect and don´t move at all. There´s a lot of different "ear pieces" in both rubber, foam and plastic and many sizes. So all in all this is one of favorite piece of kit.
Good earphones in overall. If you had experience with something like Westone's IEMs, you might find Shure's are a little uncomfortable (just not so ergonomic, but if you do not use them 24/7 they are bearable, and later you will get use to them any way), But Westone's are not so reliable. Shure's are much better.
Sound is good as well, however not very linear. Sensitive highs, powerful and clear lows. Many people notice, that mids are a little too loud. You must use EQ for music listening. They can be good for voice monitoring, I think, but this is just my supposition. However they provide better sound isolation, than Westone's, and they sits better in the ear channels, even when you use the same ear tips (yes - Westone's and Shure's SEx35 can be used with the same SHURE PA 910 ear tips)
I must notice, that, if you use them 24/7, then the moist from your ears will start to accumulate inside the earphones, then there will be a drops of water, and the water can cause some cooper surfaces to corrode, thus causing damage to the circuits and cable's sockets from inside - this is not fixable, and cleaning the sockets will not help. NEVER use them 24/7. However, that is not very pleasant anyway, because your year channels will start to itch after like 8 hours of usage )).
In overall - very good quality and performance/price rate. The only better IEMs are probably 4-drivers Shure IEMs (it is quite a new model), and custom Ultimate Eears IEMs, but their prices are beyond my pocket size )).
First impression: if you put them on, you will never want to take them off :).
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