Fender flares... good or bad?

[batboy]

I just bought a full size Blazer Silverado 4X4 and plan on switching the wimpy tires on it for 33" BF Goodrich All Terrain Radial tires on my poor worn out Suburban. Since the 'burb was a rusted out beater, I never worried about gravel and mud flying off the bigger tires. But, I was thinking about installing fender flares on the Blazer. Looks like I can get a decent price on Bushwacker Extend-A-Fender flares. Are these worth buying? Anyone have these? Do they fit and look good? Any better options? Other comments? Thanks.