Good question. I'm very pleased with Auctiva, and constantly thank them for the awesome FREE services.
I get answers pretty fast in the forum, and for those questions for which I do not, I post them as trouble tickets and get a response within 24 hours.
Except for the bandwith problem it's been pretty smooth sailing, and I was new to eBay as well as Auctiva so I had a lot of learning to do. And Auctiva moved heaven and earth to solve the bandwidth problem with a minimum of service interruption. I'm sure that it cost them a small fortune yet did they ask for any money from us freeloaders? Hell no!
There's always room for improvement and YMMV depending on the features you need/use. But let's give credit where credit is due: the Auctiva glass is way more than half full.
Respectfully,
Max