Pics for reference of what I was talking about with the intermediate/transition blocks:
SE4
SE5
(Obviously they square off a fair bit more when you put some weight on them.)
SE4 due to those transition blocks filling up the "channels" just feels like it always has a lot of the blocks on the ground at any given time. It does make it a very predictable tyre, but also somewhat limits its grip as you can't really get heaps of side-bite out of it when leant over when desired (and they get really squirmy if you lower the pressures to chase grip). I definitely preferred the SE5 to the SE4 on the rear by a large margin, and I'd guess (but haven't tried) that the SE5 could work better on the front as well as it'd be easier to engage the side knobs. Overall it's a better roller due to the channels between the centre and outer blocks.
The SE3 has much shorter knobs but similar spread to the SE4, but is faster rolling. But obviously it's also pretty traction-limited in anything other than dry-weather.
I reckon they're a decent tyre, but not
great and not really worth the extra money compared to a Maxxis or whatever else. XR4 (or XR5 if you can find them) are more realistically priced, but I found them a little squirmier and more prone to bottoming out over rocks due to the thinner sidewalls.
Basically I changed to DHF 2.6 up front and Aggressor 2.5 rear and got better grip, more precision (less squirm) and markedly better rolling than any of the Bontys mentioned above. Not saying the Bontys are bad, just not well matched to 30mm ID rims as they get too square. I'd guess on a slightly narrower rim, the SE5 would be a very good allround tyre, and the SE4 a good all rounder for general trail riding.