I was already into Genesis, saw him play with them at Earl's Court in 1977, and I'd heard 'Voyage of the Acolyte' a few times when I was at uni, as my flatmate would play it sometimes, but I didn't listen to it properly at the time.
What really made me take notice was seeing a live performance of 'Clocks' shown on the Old Grey Whistle Test, around the time 'Spectral Mornings' was released. Went out and bought the album soon after. It remains one of my top five favourite albums. Within a few months I'd also bought 'Voyage of the Acolyte' and 'Please Don't Touch', and saw him live at the Hammersmith Odeon on the 'Defector' tour. By that time I was growing increasingly disenchanted with what Genesis were doing and much more interested in Hackett and Gabriel.
Lost touch with Hackett for a bit in the 1980s, after 'Highly Strung' (distracted by small children), but saw 'Guitar Noir' whilst browsing CDs in an HMV store one day in 1993, and took a chance on it.
Since then, my late wife (who was also a fan) and I have seen him live on almost every tour, and bought all of the albums, but like others here, I've been disappointed by his most recent albums, although I felt that the few tracks from them that he has played live, came across much better on stage.