My brother-in-law has one of those. I used to have one very similar to that. He skis, and likes it. I play basketball and liked it, but not as much as he did, or as much as the one I have now.
Both of us say that it feels too "open" though. I bought a McDavid Level 3 brace that has a neoprene sleeve and wraps that I like better for basketball,
For football though, it'll give you the protection you need. I wouldn't have thought of wearing anything different when I played football. Stuff OTHER than football, though, you might wanna look into McDavid's stuff. If the doc says to use that one, don't look at anything other than their Level 3 stuff. Check Eastbay, or if you have Sportsmart's in your area, you can see 'em in person. I dunno what other stores carry 'em.