The only issue with RS is the stock hard hopup rubber is better suited to 400+ fps setups rather than the 300-ish they shoot stock. Either swap the spring for something close to 400 or swap for a soft hopup rubber and you've got a gun that will shoot reliably, better and more accurately than most upgraded, and will take a beating that no other AEG can take.
Personally, I've never had an issue with mine that wasn't caused by shitty BBs, even with the stock hopup rubber. I don't game it much, but it's seen thousands of rounds of plinking and a few games and has never let me down.
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