Yes, Repp Sports is a legitimate company. They offer a variety of fitness and health supplements, including pre-workout products and muscle builders. Their products have received positive reviews from customers. For example, their Broken Arrow pre-workout has an average rating of 4.77 out of 5 stars based on 26 reviews. Another product, Raze Energy, has a rating of 4.9 out of 5 stars. However, as with any supplement, it's always a good idea to do your own research and consult with a healthcare professional before starting a new regimen.