I'm sure I am the exception, had mine until recently and to be honest Tissot had it more than me.. (3 years with the extension to the warranty due to repairs).
When it did work it was reasonable accurate HPA, Altimeter etc..
The dealer(s) did say that mine seemed to be a a bit of a Lemon, wasn't till the end that it finally got replaced had to threaten small claims court .. Straight on ebay just in case.
Regards Jon