I have had numerous pairs of these TR511s over the last five years.
I use them for timed/competitive "Ruck-Runs." They do not have the bottom grip that may be helpful climbing a rope, but other than that you have a beautiful balance of minimal support combined with sensitivity to what is under-foot. Great for obstacles and fine motor movements of the feet--it feels as if you aren't even wearing them!--and especially long-distance runs or ruck-marches (so long as your feet/legs are prepared for it). These always gave me a distinct edge over others, hands down
My only possible critique is that the break-in can be rough on the Achilles, however, it was quite manageable to break-in if you take care for a week and is on-par with similar models/brands. Durability is about 1-2 years, depending on how often you use them and the distances, which I consider great for how minimal these are. Overall, they are well-put-together; nothing materially falls apart (like similar Nike models) --I am down to the inner-Vibram sole on my third pair and still nothing has unstitched or broken open for any of them. The same cannot be said for two Nike pairs of similar design.
I hope the TR511s or a similar-design are brought back into circulation as soon as possible.