The Shure SE 110 are a set of in ear headphones designed for personal use but to me sound good enough to use for monitoring during recording as well.  I've only used these headphones for listening to music from my iPod, and for this they definitely do the job pretty well.  They have a nice full sound for such small headphones and because of this small size they are convenient to bring around and are easily fit your pocket.  Even though they do have a really good sound for listening to music, I would never mix or anything like that with these as they just aren't designed for that type of use.  However, if you want to use them for monitoring while you are recording, I believe that they would work fine for this type of use.  The Shure SE 110s are pretty comfortable as well and only if I end up using them for a while do they start to hurt my ears, but I feel that that will happen with pretty much any set of in ear headphones.  The price of the Shure SE 110s are pretty reasonable considering they are made by a great company and are built really well.  I definitely trust Shure when it comes to pretty much any type of audio gear including headphones like these and microphones as they have an impressive track record and have gear that is always reasonably priced.  If you are looking for a set of in ear headphones for general listening, the Shure SE 110s are a great choice but I would encourage those interested to shop around as there are tons of great headphones out there.  Overall, these are a great set of in ear headphones and I wholeheartedly recommend checking them out if you are in the market for a set of headphones like these.