While I agree about the tinkers failure rates making them useless, there are some good reasons to keep it. It is an easy epic pve and now pvp helm. Its a 359 helm that you can put whatever stat you feel like using on it. Also with 4.0.6, synapse springs is a very cheap and fantastic dps cooldown for any class now that they expanded it to add all primary stats. (str or agi now, instead of just int) The parachute is still handy for things. It sucks that blizzard thinks that the belt tinkers failing is part of the fun, because frankly they will NEVER be used in a raid or serious pvp by anyone with a brain. But the benefits outweigh this limitation.