The only thing I'd look out for is that it actually has ABS. It was an option, and early on, there were many confused dealers incorrectly selling them as ABS. The slotted rings on the wheels are not the indicator of ABS (they're used for traction control). Easiest way to know is if there is an 'ABS' light on the bottom left row of lights on the instrument panel. Non-ABS models don't have the light at all.
In general, these bikes are relatively bulletproof. It's a proven motor. Assuming the bike has been maintained, I wouldn't hesitate to buy one used. As others have said, give it a test ride first. If everything feels right, go for it!