We you say 'all piezo suck' are you talking from the standpoint of - in any guitar? or just in non-acoustic (solid/semihollow) guitars?I totally get these for synth but what possible advantage is gained by minimum crosstalk on and acoustic saddle? Now add the larger pickup itself and you are going to seriously mess with your core acoustic tone. I for one wouldn't even consider that for any half decent acoustic unless it was only for live work and you didn't care about the unplugged tone at all.
I say this from my standpoint and that is "all piezo suck" but you just have to make it suck the least and not trash your acoustic by fitting it.
I am pragmatic about it though and for live they still are one of the only workable options.
I have a couple acoustics (Alvarez, Ibanez) that are traditional acoustic guitars, and the piezos in those don't bother me. They're very acceptable for live use.
But I'm trying to cheat a bit and use a Godin A6 (which plays much more like an electric), just for playability reasons. I'm really trying to get this to sound like a 'great' acoustic. It does sound good. I'd just like to sound great.