The post tracking in UBB.Threads was always one of the best features. Until the recent 6.5 tracking bugs, which only affected (in my experience) a small number of sites (with large numbers of forums) UBB.Threads was unmatched in it's post tracking. The other products, UBB.Classic, VB, Invision etc.... I've always had trouble figuring out what I haven't read.
Knock on wood, of all my clients with 6.5 upgrades, only 1 really had issue with the post tracking cookie bugs. I haven't done any 6.5.1 upgrades yet, as I've advised clients to sit tight and see the reports people make.
Although I'll echo that the larger UBB.Threads sites kill the server with the full post tracking on, but the vast majority of smaller sites could handle it.
