Badbeams- yea, several of us worked on this. The TT 2L is the same format as the A2, the A2 has a better switch. The A2 is a bit brighter than the TT 2L in incandescent. The TT 2L has much increased run time (incandescent) over the A2.
Threading, workmanship, and barrel/bezel finish on both is superb.
That said, I have 2 TT 2L's, use them every day, and am happy as a pig in slop with them. $ 30 vs $ 140 or so.
And no, the SL is not made out of green cheese, left over tractor parts, or whatever some say.