I've never ridden one before, but I believe JB on here has one, and I'm sure him or whoever it was with it will respond on your question.
Speed wise, I'm sure that thing is going to run close to 80mph stock, and ride great with that IRS, it just won't be as stable a slider as say a Raptor 700 would be, but have a nicer ride and ground clearance which would make it a better trail rider to me.
05 Suzuki DR650, Mikuni TM40 flatslide pumper carb,JE 10.5:1 piston,stage 2#190 Webcam,open airbox, Twin Air,full FMF system,Pingel fuel valve,Ricor Racing rear shock, Ricor Racing fork Intiminators, Progressive springs, Sargeant seat,DRZ250 tailight,custom plate,LED's,GPS,sumo fender,PT bars,Cycra brushguards IMS lowered pegs, aluminum skid,bearing chain roller,Pirelli,tank bag(gone)
06 Zuk KQ700, Kenda Bearclaw HTR radials Warn RT25 w/ syn. line, 1.5mm clutch shims