The S-50 is a reliable machine from what I've seen at work. No real flaws or recalls. The only thing I don't care for is when it comes time to check the valves, it's a real fun task!!!
Reason being is that the frame of the bike sets very close to where you get in to the valves. The first time I did one i went ahead and bent a couple of feeler gauges so i would have them for the next time. Other than that there is nothing else that i've seen, they are a little bigger than the savage, but not much. If i was you, looking for a bigger bike, look at the M-50, considered a muscle bike, cost only about $400-500 dollars more and you'll get fuel injection instead of a carb., and it's a sweet looking bike that's not some monster that you have to fight with at slow speeds or stops. comes in blue,red and black (black is a little cheaper. hope this helps you out!!!