I can't complain with it. I just joined Second Life last night, coming over from IMVU and had an issue where I purchased an item from the web catalog. I received confirmation that I received it, but the item never appeared in my inventory....ANY WHERE. So I filed a ticket, and within 3 hrs I received a response that the item would be delivered again.
So in that sense, I feel that I did receive a pretty fast response. At IMVU, even with owning their VIP Subscription, I would have waited 24-48 hrs for them to respond.