I ride a 525 EXC and love it...best bike I've ever owned and this is the longest time I've ever held onto a bike as I just dont see any good reason to part with it. It still runs strong and is basically the same tech as an '07 model with the exception that the newer 525 got tamed a little too much for my liking. Yeah the '03 is the brutal one
Obvviously I like the power delivery. Why? Basically because I'm one lazy bastard.
I may be a bit quicker on lets say, a 250cc 4 stroke...but the effort required to maintain that pace on a smaller bike is more than I'm prepared to put in hehe.
Suspension is okay but I never liked the forks, but after removing some bushings and drilling some holes in the inner sliders, they've improved out of sight.
Other things like jetting was very simple...I just threw in a JD kit (easy as pie) and noticed an immediate improvement, especially the mileage, but I also did the Honda diagphram mod at the same time so the improvement in fuel consumption could be attributed to this as well.
Also have heated hand grips coz I'm a girly man and I'm putting in a Rekluse auto clutch as we speak...not for any riding advantage (I prefer the clutch actaully) but because I've developed chronic teninitis in my clutch fingers and literally cant use the clutch after about 30 minutes from pain. I can hang on all day without pain but as soon as I clutch...OUCH!
What else...I hate that it chews rear knobblies.
I love lofting the front over anything, any time without any effort (the lazy factor again).
The front brake takes some getting used to...gets a bit squishy.
Maintanance I would say is low...well lower than what I would expect from such a high performance bike. I've had this bad boy for over 3 years now and I've adjusted the valves 4 times. In all those times the valves have been bugger all out anyway. The first adjustment was the worst but since then they've been great. 3 years...countless kms and 4 adjusts...go figure. Actually make that 5 ajusts as I'm about to tear into her before the ride this weekend.
I do run Flashlube fuel additive though so maybe this has something to do with the valave reliability.
I probably could change the oil in her more often. Sometimes I let it go for anything up to 1000kms but I've torn into the gearbox and clutch for a look and not a shred of wear anywhere. Barrel still looks like new and not a mark on the piston...havent checked the ring gap but hey it doesnt blow smoke
Basically I've put this thing through the wringer for 3 years and it wont quit and thats why this bike is the best ever made kthxbye.