Just got the update downloaded and opened...
So far (5 min):
Synths sound great (although admittedly I do not use them as often as some of you will), and the AmpRack is a decent upgrade... but again, only use it for scratch tracks (even then there are better freeware amps to use like LePou).
Have not tried the editing/comp improvements yet, but I will probably use those most. Definitely interested in these improvements.
Bottom line, I look at this as a "pre-pay" for 7 in a sense, if that is in fact what happens. If there is no break for a 6.5 to 7 update, then I am a dummy!!
However, it was $49.99 and I think it was totally worth it, synths alone.