I'm on a pretty tight budget and just put a Oleson screen in my 2.8D last week. Its a great improvement over the original screen. If you've got the money for the Maxwell screen, why not go for it? You'll have the most expensive screen money can buy and your mind will be at ease. If you just want a better screen than what you've got now and are tight on cash I don't think you'll be disappointed with Rick Oleson's screen, the whole screen is brighter especially in the corners and the split prism is a nice aid as well.
Adam