Otto, seriously, i wouldn't let much of the "bug scares" get to you, unless you're expecting some end-all be-all, which it surely is not..
Compared to other synths over the years it is not any more frustrating to use...there's just a few things that make me say "meh" and like anything, it's not perfect. Even the greatest synths have their problems. You know, for some a cherry early Minimoog D is the apex, I guess, for others it's too limited and/or just plain old and useless.
A6 is an oustanding acheivement and certain classic imho. Vintage hoarder/resuscitator/programmer-extraordinaire Don Solaris says get 'em NOW, while they're a steal (and the dollar still counts for something). I agree.
I wouldn't buy any expensive instrument without playing it personally 1st . By all means go try out the prospective A6 in person - or buy ONLY from someone who's rep you are able to have high confidence in. Preferably both.
The A6 is a very unusual synth in a lot of ways. It reminds me of Prophet sometimes, a memorymoog other times, OB-X/Matrix/Expander in several ways...a Jupiter slightly, CS-80 not really other than the ribbon.
But it's really so much different than anything else.
It's "signature sound" if it has any in particular, i suppose would be a fizzy/sizzly saw wave warbling continuously (esp. w/ bkgrnd tuning OFF) thru dual analog "chip" filters. i emphasise "chip" filter since the 24dB LPF is no Moog ladder, and the OB filter, while closer to CEM-based Matrix in some ways, is just a great filter with it's own character - the way the res overdrives and how it brings it's own particular flavor of emphasis. Mixing (and modulating) the 3 modes simultaneously is wonderful stuff.
Sounds freaking beautiful next to Juno6 'cause Juno is so simple, well-mannered, purposeful and direct - while A6 is complex, mysterious and a bit ghostly, or fuzzy as h**l and angry. It would be space-out city w/ a Polysix....and makes the most incredible pads I've ever done when layered w/ V-Synth...and sounds real nice going through quality outboard, especially something w/ some stereo spread.
As you may already know - 90% of the presets are really, REALLY lame. Probably the lamest of any synth considering what it can really
It's also easy to make it sound like s**t since most 'classic' synth sounds are very simple in comparison to the A6 architecture, so it's easy to just pile stuff on and ruin it. BUT...intuition is often rewarded on the A6! The manual is a freaking Biggie-size Bible but it's only needed for the occasional reference. Begs you to program it for months on end. I've made over 6 dozen patches so far that run the gamut fairly wide - i use patches mostly as 'starting points' not the end-sound...much quicker to be happy with a sound and move on than my old Supernova2 board, by far.