Yes and no, usually they have problems before 80k, but the modded sensor and wiring loom does greatly help with the cold start performance.
Its about 55quid from the dealer.
Obviously HT system in top order first is the way to go, but I would definately do the ATS mod as well, it'll probably pay for itself in better mpg (especially on short runs) and piece of mind the thing will actually start on demand. (and not cost you 200quid in a new starter and battery which you are slowly killing)
Tim..