I have a Burris Fullfield E1 (not a Fullfield II; I haven't seen a FFII E1, just the Fullfields). Mine is a 2-7x, been using it on a general-purpose AR with no problems. Love the E1 Ballistic Plex reticle for longer-range targets.
It's not too heavy, but it IS rather large and bulky, with the adjustment covers/caps being larger than really needed, IMO. If sleek is what you seek, this probably ain't it.