This post is from Myrick, who gigs with a DPA 4021. I, too, was tempted to buy one, and sell my Neumann 185, but in the end I didn't do it. First, the DPA is more than two times as expensive than the 185 (at least here in Europe), and I doubt whether the sound would be noticeably better with the DPA. Moreover, on the one hand it might be less hassle to have a mic directly on your bass, instead of setting up a mic stand etc. Yet, I do like the idea that no cables or whatsoever are attached to my bass; that it really is an acoustic instrument, and not an electro-acoustic instrument (although, in the end, the bass still is amplified, so this argument might be less than convincing for some...). Plus, I am able to control my sound by altering the position of the bass relative to the mic. This really is an advantage! Nevertheless, the DPA is a very,very high quality product, and I am convinced it would work wery well with a bass, provided the rest of your gear is up to par, of course...
Cheers,
Vincent