I saw some folks in GCR (Greater China Region) doing a review on 8420 Street Bike recently, that reminded me of this old set which I got quite sometime ago. With a engine, gearing system, and suspension mechanism, plus many parts (such as the two big wheels) which are not available else where, it is a great set with great playability.
Somehow I sense that this item has been quite hot in mainland China, but I do not see many talking about it here in Hong Kong, the price has reached around USD 90 already here, not much more costly than bricklink price.
By the way, I have taken a set of outdoor pictures of this bike model:
This red Lego 8420 Street Bike in my opinion is one of the best set of Bike (or may be one of the best Technic Set) ever made by Lego.