I have a pretty old Anser 2 that I really used to like. I never use it anymore.
I wish they'd have made a huge Redwood line like they did the G2 line. I love the look of several of the G2 putters.
1.G2 Tess (heel shafted blade 332 gram head)
2.G2 MiniC (Center shafted face balanced wide flange 350 gram head)
3.G2 C67 (Center shafted heel-toe balanced 349 gram head)
I'd have to go with the one I carry in my bag. But to be honest I don't have any experience with other types of Pings. I did briefly own and game a new (well slightly used) Karsten Series Anser, but after about a month I traded it in with a few other clubs for my current driver. Frankly I was more comfortable and happier with my old putter (sound, look, feel), but the new one worked just fine.
I've only tried the one, but my mate has an Anser 2 (not sure if this is the exact model) and it is a beauty- perfectly weighted and with no bounce. Whenever I'm lining up with the thing I have alot more confidence than I do with my existing flatstick (a $30 bargain bin no-namer). I'm aiming to pick up an Anser 2 of my own (or a Scotty Cameron should I win the lottery).
The golf shop I frequent has had a left-handed 34-inch G5i Tess in stock for at least a year. No one has bought it, and the price has never been marked down. I'm hoping the latter happens before the former.