I've owned a pair of 66's for 4 years now, and have used them regularly during that time. They are still in 'good condition' no holes, rips or tears - the paintwork has deteriorated and the sole has worn down (not completely - but that's typical). I'm surprised they lasted me this long, did not realise they were that old until I remembered when I bought them!
I thought I'd buy a new pair since my current pair has velcro straps and having laces and a new colour would be great.
Overall, fantastic trainers, really comfortable and light. For some people, the cushioning is not 'deep' or heavily supportive, which may concern some people with feet problems. However, the cushioning is perfect for casual wear!