Add some EQ to the 950, for BT and for the price, it is excellent for dub step. it has a slower, rounder bass. More suited to hip hop, dub, dub step, dnb than that the fast snappy kicks of trance, edm. It does good on electro basses. Some techno is quite good. But if I want a faster kick, my hd25 and 7550 is going to provide it.
Quite like what I heard from the ue6000, haven't heard the ue9000. Thought the bass wasn't as controlled on the ue6000 as it was on my denon d600s. A bit one note. On the 950, the bass is actually quite good, seems less one note, but a bit loose. When the DSP is engaged, it can almost be a bit distorted. But hey, that's that 'club sound'.
too my memory, the UE6000 did low bass better than the MDR-1r series. In fact, the 1r, just didn't have enough low end for my liking. The 950 is much better in this respect. Also, for portable usage, I'm finding the 950 better isolating with no interference from wind.
In store they may have demo 950AP versions, which are quite similar to the BT sound without the bass boost.
Edit: just did some testing with 950Bt with some dub step. Seems like Sony practically designed this headphone for this music style. The Electro Mode suit the frequency ranges of the bass drops without losing any clarity to the rest of the range. Oddly this isn't the case with other music styles. I think a lot of it has to do how these tracks are mastered really to push the bass range clearly to the foreground.