In reply to stp:
yesyesyesyesyesyesyesyes.
As somebody that seems to be prone to tendon problems (patella tendonitis, mostly cleared up tennis/golfers elbow) the thing is an absolute god-send. Should be required kit IMHO!
Orange roller seems to be not much use unless you have giant forearms, the grey rubber one is too sticky and just rips out all the hair on your arms. White plastic attachment is fantastic.
Unsure how much effect the brutal massage had in isolation, but it allowed me to get the pain to a manageable level so I could complete a program of eccentrics with a flexbar which cleared up my quite severe tennis elbow. I'm religious about using my armaid after climbing, and use it on most rest days too. My only gripe is that the handles at the top seem like they could be better designed. If your hands are wrecked after a days climbing the last thing you want to be doing is essentially a wide pinch grip :
edit: forgot to mention that the strap that goes around your leg is useless IMHO. best thing to do is remove the whole thing and sit on an office chair or similar and put the base between your thighs. Far less fiddly though there is the risk of skin getting trapped in the pivot... (don't ask)
Post edited at 17:28