First, buy only from a dealer who will set it up with the correct springs before sending it to you. Don't even bother if you can't, or you belong to the target weight group (160 lbs with gear). I've heard that Dan Kyle will set it up for you before purchase, as will a few other Ohlins dealers.
If you're a street rider and do the occasional trackday, R&T forks should be perfect. If you are buying it for a racebike, a better bet would be the Ohlins 25mm cartridge kit dropped into the stock forks. The R&Ts are compromised for both street and track duty, so they have a lot more travel built into them, that will prove to be a slight hindrance at the track. Of course, you can harden settings on the R&T for track duty, but they are still perceptibly softer than a race cartridge equipped bike that has damping optimised for fast track work. Track suspension systems don't have to deal with potholes and square-edged bumps that you find on the street - that won't dive too much hard on the brakes, but will still extend optimally on the throttle coming out of corners. They will have harder built-in high-speed compression (non adjustable on both the R&Ts and the drop-in cartridge) compared to a road-biased fork.
I think a search will uncover more than a handful of reviews of the Ohlins 46 series of shocks. In recent years, stock rear shocks have come to a point where they perform almost as well as aftermarket stuff, leaving lighter weight and ease of re-build as the two remaining advantages of one over the other. Meaning that, on the street, you may not notice a huge difference swopping out your stock shock for an Ohlins. The better aftermarket units only start to shine when you tailor them for your weight and riding, and take them to a track where you will find that they don't fade as much (if at all), and feel the same on the last lap of the day as they did on your first.