I picked up the Shure SE215s earlier in the week and have been quite impresses with them. The are a warm IEM, with great isolation, great sound separation, a good sense of airiness or ambience, seem pretty rugged, are light for work-outs. Here's my comparison to the Monster Turbine Pro Coppers, copied from another thread:
I've had a chance to do a side by side comparison between the SE215s and the Moster Turbine Pro Coppers. The following are my impressions (music selection: Bekki Williams's Innersense):
Bass: There is a lot of similarity in the bass characteristics of the SE215s and the MTPCs to my ear. The MTPC's bass is a bit more pronounced, but at the same time a bit boomier, with a bit more emphasis in the mid bass than the SE215. The SE215 goes deeper, seemingly more linearly. Overall, I like the SE215 better. Winner: SE215
Mids: Wow, compared to the MTPCs, the SE215s really shine here. The SE215s mid are more forward, more organic, and just more pleasant to my ear. Winner: SE215
Treble: Quantity wise, the MTPCs has more treble and better treble extension. Both can be a bit strident at times. The MTPC has more sparkle. The SE215 is a bit warmer. It comes down to a matter of preference. Winner: MTPC.
Ergonomics: Both have more microphonics than the UE700s or W3s. When moving around, the cable noise of both seemed about equal. However, when comparing which tip is held better on the sound tube, the SE215s win. I suspect it's due to the relatively loose fit of the Comply tips on the MTPCs sound tubes. In fact, I've switched to using the Comply's made for the UE Super.Fi / Triple.Fi series since these are 0.2mm smaller in diameter and just fit the MTPCs better. I'm tired of having the Complies come off of the MTPCs in my ears. Winner: SE215s for the better grip on the tips.
Sound Isolation: No question here but that the SE215s provide more isolation than the MTPCs (Comply tips used on the MTPCs, Shure foams on the SE215s.) I've always been a bit disappointed with the isolation of the MTPCs. The sound is probably due to the loose fit of the tips noted above. Winner: SE215s.
Spaciousness: This is a tough contest. The strong treble performance of the MTPCs gives the music some air and ambience that the SE215s lack. The sound stage is about equal. But, even with the air, the MTPCs sound a bit muffled and locked in, especially at lower volume levels, perhaps due to the different mid and upper mid treatment. It's a hard choice, but I think the MTPCs have the edge. Winner: MTPCs.
Winner: SE215s by a bit, but it's not a huge margin. If you factor in the cost of the MTPCs, there is quite a difference in favor of the SE215s.