Not much, a least for this Schoeps m/s taper.
The existence of the PFA and the ease of M/S conversion either live (on a modern all in one pre/ad) or in post means that there are smaller solutions to get m/s actives to a preamp.
Chris King was nice enough to lend me his for a while. It's cool looking, but my old littlebox does the same thing, fits my bag better, has longer battery life, and I don't think I hear any sonic improvement.
I take all of this back. I was wrong. I ended up with a kcy only VMS, and think it's just wonderful.