A level is a level. I use the one that came with my vortex razor and it has been great. There's a lot of different brands of scope levels out there: US optics, Flatline ops, Vortex, Sphur (built into one piece mount). And that's just a very small number and those range anywhere from $40 - $410. They all work the same if you set them up properly. So how much you wanna pay? IMHO go with a sub $100 one and put the rest of your dough towards ammo.