I just picked up a used 710 myself.. The car is still very fast.. I have laid down some really fast qual. runs setting TQ for the past 3 weeks.. The car is a bit twichy, i think this is why the got away from the rear steer on the 720.. The main differences are the front and rear suspension.. As for parts still VERY easy to get.. If you need a good starting point for set-up PM me and ill give ya what i run on med grip asphalt..Great place for parts in the US..
www.ashfordhobby.com