If you like the AR-15 design, you should be happy with an AR-10. I like mine. It's been very reliable. Good acuracy. Not much recoil. The only issue I have with it is the muzzle brake. Makes it VERY loud. I've never shot one without a muzzle brake, so I don't know if I would prefer to keep the brake or lose it. Not really an option, as they all come with one permanently attached.
My AR-10A4 carbine is a flat top. I figured a .308 is a scoped rifle. At 100yds. the front sight on my Bushmaster AR-15 is wider than a six inch target. the range of a .308 goes well beyond that, making a scope the only practical solution for me.