I was in with you in the last session, when you were on the Slash. I was the bloke on the SB66!
The SB66 was very good. I spent most of the time comparing it to my hardtail though… it’s been a long time since I rode a full susser but it felt very competent. Maybe not quite a stiff as I expected but it was a good climber, rode very light and just flew downhill. It ran 32mm Fox forks but should/could have run something bigger up front. The frame felt more capable than the fork, to me. I didn’t feel that slack either, which was nice (some slack bikes just feel cumbersome to me, like the Spicy for example).
The main thing I noticed related to the length of the back end, compared to my hardtail. Because it was longer it:
a) didn’t want to lift the front so easily
b) wasn’t quite as nimble picking lines when going up hill
A longer fork would help with a) I suspect, by putting more weight over the back end but then a longer fork would make it slacker, which may make b) even worse