I just ordered a set of the EP Weichs and I eagerly await their arrival! I've been using EP regular G&D with Spiros on the E&A (I've used both weich and mittel). I was thinking of just ordering the EP Weich E&A, because I like the regular G&D just fine, but a bunch of folks here advised against mixing them. I recall the EP regular E&A being a little stiff and dull sounding.
I've gone through a lot of string changes recently, mostly because I only have one bass now. I've put the gut habit aside for the time being because I like to practice arco and I hate bowing on plain gut. I like Spirocores quite a bit, but for much of the Nashville stuff that I do, they're just a bit too "steely", especially the high strings. The Spiro/Evah mixes have worked well, but I still would like to go darker on the bottom. So, I have high hopes for the EP Weichs, based on what I've been reading.