These have been my daily drivers for years. They are well made, lasting from a year and half to two with daily use. Nothing fancy going on inside, so your feet have enough room. On the playa they breathe better then Doc's, from my experience. Although can get a bit hot at times. A lot of the airflow comes down to how tight you laced them, and if you modified the top strap to buckle tight.
As for other T.U.K. unisex boots, I've owned the A6072, and T2161 mid/high calf boots. Both of them have the same durability as the A6055, although tend to get bends/cracks in the leather at the ankle.
Sizing may be one to two lower then your normal sneaker size.
Link to Manufacturers store: http://goo.gl/zoEcH
I've been able to find these boots for $10 to $30 off on eBay, and at independent leather/fetish shops or emporiums.