i have the 50cm THPs, i could barely bend my wrists if i tried as had as i could. so the longer ones would be solid. i will warn that they do take some getting used to, as they do hurt until they soften up a bit lol just got to harden up
i also got 24" RPM's, softer then the THP but still give great support
for the 40 bucks id say wither are worth it, and thats for the longest (36") pair (have not used the longest b4 so i cant comment on them, but common sense would tell me that they give better support again over the 50cm and 24")