I've had the Silver 2's for a couple of years now & am pretty content with them--enough so that when I fantasize about something better, I include MA. Anyways, from what I've heard so far, a significant, all over improvement is going to require a pretty large jump in price (percentage wise) or size (they compare very well to smaller floorstanders).
Soundwise they're a bit hard to characterize as they've been consistently revealing of any upstream changes--the treble which I worried was a bit dry & analytic was much improved by a dac swap, and the bass, which I worried was a bit boomy, tightened substantially with a better more powerful amp.
However, they aren't magical speakers to fall in love with. In the 90s I had a pair of Castle's that had such a 'perfect' (forward) mid-range, that the slight lack of upper register detail, and bass best described as implicit rather than explicit, just didn't matter...
Hope this helps,
Kirk