Just been pointed to this thread by someone on Vec-c.com in my thread about it here http://www.vectra-c.com/forum/showthread.php?213492-That-was-a-close-one
I've just had the balance chain tensioner fail on my 2.0T after less than nine months since it was replaced. I bought the timing chain kit and tensioner kit seperately, one came from here and one came from Neo Brothers, couldn't remember which was which until I checked last night. The balancer chain kit came from Neos so you're off the hook there @[deleted] lol.
Very slightly different symptoms though, the piston on the tensioner locked in place completely when pushed in (no apparent ratchet to stop it compared to the old one), you could unlock it and it would pop out again, but the second it got pushed in again it locked into place again.

