I thought the bass response was great, but again, their very source dependent and yeah, you definitely need to jam them up in their for a good seal. If your not getting a good bass response, they weren't inserted properly (its a common complaint on head-fi until people get a good seal). I also found them to be a big painful at times thanks to the foamies hardening in the winter cold.
Shures are known to be warm, but suffer from high frequency roll off.