I have one of each, so I guess I'm still waiting for those too ^_^

Got my Ahamkura spine from the one time Xur had the arm engram to gamble on. Tossed it in the bank because it looked cool and I didn't need shards. Then I got every piece of raid gear except arms...guess what my level 30 Hunter is wearing now? :/

It's honestly my favorite. the extended time for tripmines isn't just a few extra seconds- it triples the time they stay out. incredible for pvp, as they work similar to a claymore, but i'd rather use knucklehead or symbiote for pve.

I am finding I mostly use Knucklehead Radar or Lucky Raspberry. Rader because of the radar but also the super energy from kills and Raspberry because of the heavy ammo. Once I get my raid boots I will mostly likely just use Alpha Lupi though because of creating more orbs.