I swear Xûr isn't going to sell them any time soon.
I haven't seen a boot engram drop from ToC in eons.
If Xûr does sell a boot engram, it's a legacy engram.
Nightfalls pretty much only reward crap legendaries now.
Pretty sure these are the most difficult exotic to acquire.
[i]~Nyahh! =^,.,^=[/i]
I wanted them for ages and couldn't get them to drop for me but finally they did from one of the crucible bounties. The automatic reload perk is pretty useful but I don't really see the need to move faster while crouching. If you crouch and move around in the tower, the extra speed just makes your character look retarded.