I put a set of BT-45s on at the beginning of this year.
5050 miles do far.
The rear is almost done with less than a sixteenth inch
of tread depth left. I'm hoping to replace it with something
that will last longer; mostly commuting miles.
The front, however, still has a least an eighth inch of
tread depth left and plenty of miles to go.
In addition to decent life, the tire exhibits even
wear across the tread with very little evidence of cupping.
Overall, a pretty good tire with excellent straight line
stability and very neutral handling if somewhat heavy
turn-in.
Given a choice, I prefer a tire with a little better feedback
as this tire requires a fair amount of faith to go fast
but it performs well when asked, with no surprises.