This is a favorite question of people in many forums, and it's not limited to one particular company. Like cars, you will always find people who dislike or rave about a particular brand. And, some manufactures make a consistently better line of products than others. Despite that, quality control is a problem throughout the RV industry, and you will find issues, sometimes severe with all brands.
R-Vision has their problems too, largely with customer service, a lousy website, and some quality control problems. I'll stick up for them and say that overall, R-Vision makes a good product, especially for the money. I've had experience with them. It's important to buy from a reputable dealer who will stand by their product and service what they sell. That way, you will hopefully not have to deal with R-Vision directly.
A good source of information on R-Vision products is the http://www.r-visioncamping.org/
website where you will find a cross-section of owners/members who are honest about their trailers, sometimes brutally honest. The site is friendly and much more helpful than the R-Vision company site, and it is not supported by the company.