Ken and I recently traded some PM's on the WWU / S2 issue. I like the WWU with the S2 410 much more than I ever did with the S1 also. Not my favorite pairing but definitely better than the S1/WWU combo.
JC
+1 It's amazing how some heads can really be impacted by different cab voicings, versus other heads that seem to work well with just about anything.
I'm in such a tizzy over the SD800/410UL(II) that I just can't quite get myself to swap it out for the Walter at this point. It does sound darn good though!

