They feel a little in the hand BUT they (next to an AUG) are probably the most ergonomic rifle I have ever fired. They just nestle right up in to your shoulder and feel like god intended for it to be there. You want a bulky rifle get you a FS2000.
The trigger is garbage, like I said it reminds me of a NERF gun. There may be some after market parts to address that now, haven't looked into accessories in years.
One good thing about them is they hold their value well, especially if you can find an early model. Don't be afraid of the white ring/ghost sights on the early guns if you find one equipped with them. The REM T3 is an easy add on and works wonderfully.
At the end of the day they are just a fun plinker, I've run a few playing around but never bothered to test accuracy.
I hate they stopped making the AR57 uppers, would love to have one in a pistol format.