I got mine back from Astech about two weeks ago, took it for a couple 200-300 mile rides and sent it back last week for reworking. They were a little better than the stock, nothing like I expected, with all the hype on column buckling gel and multi-layer memory foam.
I must say that when I emailed them my negative review of the seat, they were surprised at it and offered to have it shipped both ways free of charge and to re-do it; he asked 2 dozen questions, of which I gave him specific answers to, so I am hoping that they will be better than the first round. Of course, if they had asked the questions the first round, it may have gone better.
Right now, for LT seats anyway, I give them a thumbs down. We'll see how they feel when they're returned this week. I hope I can go with a thumbs up.