R.C. and many others like BDS, and even basic Shyjacker units are what they are, cheap straight forward mass produce components for one purpose- bigger tires. Yes they'll clear what the manufacture recomends, no they will not drastically improve ride or proformance. They do however meet the needs of their intended market. It's a question of budget long and short term. If your ultimately going to get the urge to go bigger or hope to gain performance save your money do some research. You'll spend less in the longrun from rework startovers so to speak.
i'd run one for the cheap route, they fit and do what they were built for, your vehicle however will not become a superstar because of it.