I eventually got a GPS watch approx a year ago (again kindly provided free of charge, by a very occasional forumite and friend)

I must admit i got quite engrossed in looking at all the data. Particularly looking at my rep sessions in minute detail on the PC screen to see where i could improve.

Although now the novelty has worn off, the only thing i find useful over and above a normal stopwatch is the fact that i can measure my distance for reps and total run distance. I tend to not even bother checking my pace when doing reps/races now.... feeling that i know when i'm pushing or have got more to give.