Since I'm prone to spur of the moment mad scratch builds and flying in rough terrain, I use Raycorp/Gemfan(seems to be the same brand) almost exclusively because of their bulk prices on Amazon. Once I slow down a little bit and have a few builds I can fly extremely consistently, I may buy some fancier props. The secret about Raycorp/Gemfan, is some of their props are quite good and have a real beefy, rigid airfoil and are really hard to damage. Their 5x5.45x2 "King Kong" bullnose are outstanding and durable props with a fat airfoil, where their 5x3x3 are the flimsiest, floppiest, easiest breaking, nasty noise on high throttle making pieces of straight up jank I've ever used. They still work, but they are definitely not a quality product like the Kongs. The 5x5.5x3 "Hulkies" are also solid performers. They have a fancy air foil and a lot of thrust, but not quite as durable as the King Kongs.
Basically, its hit or miss with that brand, but the price is right.