I've not personally got my hands on one of those eBay ones yet, but I'm getting a couple sent over from Thailand soon to (a) use on a display, and (b) have one tested to destruction on a pressure rig. Not so I can be happy that they are good to use, but just to see what happens when they are put under pressure.
Even if it stands up to a high pressure test, I wouldn't personally be happy to trust quality control consistency, on the road or track.
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Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
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