As a drummer, I've been very happy with the SE215 in-ears. We play metal fairly loud, but these have more than enough protection to keep my hearing safe during live gigs, practice, and recording. Live, I get the kick drum and guitars into my in-ears. In the studio, I can get a bit of a set mix in combination with the live sound that comes through and a click track. During practice, I get kick monitoring and possibly a click track. The sound quality is very good, you could easily use these for music listening as well. Balanced and clear sound. I've had these for a few years now and they're still going strong, excellent build quality and durability.
They're not perfect though: the noise cancellation is not entirely balanced and high frequencies are blocked a bit too much. For me, this leads to hitting cymbals harder than necessary. As with any in-ear devices, they do begin to hurt after a couple hours of wearing them. Keeping the plugs clean is also a tad problematic, as earwax tends to build up inside the earplugs, and I do clean my ears. Minor issues overall though, definitely recommended for drummers.