What the heck, I may as well chime in. I've had EP weichs on my Upton for about a year and a half; before that EP regular (mittel?). Used them for full on arco gigs, including recording with a very good chamber orchestra, and totally pizz stuff. Just put an old Olive G on to try, and I'm not sure it's an improvement. The balance on the EP weichs is really good. Never have any problems with amplification (Upton rev solo pickup and Acoustic Image Coda amp), or anything else for that matter. Not quite as dark as the regular EPs, on this bass, which is a good thing. I'll probably stick with them.
They're probably not my choice for my old French bass, though. Still in a state of flux there. Maybe the regular EPs... or Kaplan...
