Originally Posted by AndrewF
For exercise, including C2, you want the UM2's. I've erged several millions meters with them and they are great. excellent isolation, particularly with shure olives or modded biflanges. they get loud, they have great bass, and they sound great with rock, which is what i listen to on the C2. i had the sa6 and returned them- didn't get loud enough without an amp and anemic bass, even with a good seal.
The UM2 seem great for work-outs, but I wonder how the Atrio M5/M8 compare. I get an impression that the Atrios have better SQ, and they
do come at 2/3 of the UM2 price, so being "almost as good" for work-outs will suffice.