My son learned on a DS80 (same bike as the JR80-diff plastic). If your son is coming off a Husky Sr., the JR80 won't last long. It has a pretty bullet proof engine, but not much power. The suspension is terrible, especially the front which is very prone to breaking/bending the tripple clamp if it is ridden hard. The bike is just about the same speed as a XR80, without the low end torque. It is probably not much faster than that Husky, and the Husky is probably better suspended. I would personally recommend a KX/RM 65 if your kid races, or a XR80/100 if not.
Eric