Like all the Q chairs it all depends.
A Q500 can be 4mph, 2 pole, VR2 weedy controller, no seating options, etc. And so a super basic (cheap light) chair.
Or it can be 3x the price, with 8mph, 4 pole, 120A controller, Lift, Tilt, Recline, Power Centre Footplate, gyro, fancy armpads, headrest, lights, bigger wider tyres, and a CTRL-5 controller for the seating. And more.
So theres no such thing as "a Q500" as such. It depends drastically on options. The Q700s already have all the best options already applied, as well as front suspension.
Both the Q500R and Q700R have that terrible swinging rear beam suspension. Which needs a bolt through it to stop it doing that...
Its a triumph of marketing over common sense and engineering. BECAUSE all rear drive chairs sold are so stupidly front heavy as stock before you fix them, that they need that swinging beam effort to try and keep the rear wheels in ground contact as you go over uneven ground, top of a ramp, etc. As the chair follows the front casters instead of the drive wheels. But once you fix that, by moving the seat back so it steers properly then that swinging rear axle is a liability. It was a "fix" that was invented to repair the damage a stupidly nose heavy RWD chair (their fault, swing away leg rests, too narrow front gap etc) caused. A fudge to try to cure another cockup. Only a chair designed by comittee could be that way. All easily fixed afterwards fortunately. And then all their marketing hype is seen to be bullshit.
