I've put about 500-1000 rounds downrange with my RRA, on feed ramps that look exactly the same with absolutely *NO* hiccup. (Actually I'm glad that you posted this because I've always been curious about the feedramps myself.)
While they're not M4 feedramps (they don't look like it, right?), I've shot about 100 rounds of 50gr hollowpoints out of it and never once did it fail to feed, fire and extract.
In my humble and relatively inexperienced opinion, unless you're shooting full auto in adverse conditions I wouldn't worry much about the feed ramps.
Hope this helps.
*Edit:* I have to admit, these LMT feedramps are sexy (and confidence inspiring) though:
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