On my Six Pack, I went from 2.5 Syncros BHTs to 2.5 Kaisers (not Projekt) FR/RR to 2.75 Dirt Wizards
On my Blizzard, I went from 2.35 Kenda Excavators to first-generation 2.4 Barons FR/RR to 2.35 Magic Mary/Nobby Nic
On my Slayer, I'm currently running 2.5 Butcher SXs for pedally days to save a little weight and Kaisers FR/RR for occasional park/shuttle days
On my ETSX, I went from Trail Kings to Excavators to Baron Projekts
Kaiser FR/RR is my favourite tire out of those listed above for every condition I've ridden with them: dusty summer to damp winter. The only reason I don't run them on everything all the time is that the 2.5 steel bead is a little heavier than I'd like for long rides and I can't fit a 2.5 on my "smaller" bikes.
A 2.35 MM only lasted one ride on the Blizzard before it started to buzz the chainstays continuously and I had to step down to the NN. I don't like the NNs, but the 2.4 Baron Projekts are a little smaller a casing than I want on the HT. I'm still thinking of going back to the Baron Projekt on the rear though.