I have Leupold on my Desert Eagle .50AE. I went through several other brands that had the innards shoot loose before I got to this one. No problems at all with this one.
Pay close attention to your mounts too. You'll want something that lets you see the iron sights, and something very strong. I've broken two mounts before I got to where I am now. I will look at the mounts and rings when I get back to the house, but I don't remember the brand on there now... The see through part is much more handy and important than I thought it would be...