A Y Plate 600 with just 1900 miles on it!!!!!
Stop shouting first
Compared to the P plate CBR you will find the wind buffetting you around a lot but in terms of performance, the Fazer will be just as quick and stop even quicker (if the brakes havent seized).
Things to look out for on the FZS600 are few and far between. If it seems a bit vibbey, it probably needs the carbs balanced or the TPS reseting. Neither are big jobs.
Downpipes rot very quickly and the headlights are shite (square light model) but easily fixable (dual light mod or HID's). Apart from that, not a lot goes wrong with them.
Given the age and mileage, if you do go for it, I would suggest a good look at replacing the tyres and a good service but apart from that, enjoy!