I had a stainless ranch for a while.. light and handy yes.
PROS --
It shoulders quick, to me felt nice, and was decently accurate. Not great mind you... but that could have just been my discomfort with the sights and not the intrinsic accuracy of the rifle. Mounting a compact scope likely would have definately helped. Another neat thing is the dinky little rear sight can be folded down, letting you use the front sight almost like a shotgun bead. It lines up nicely with the scope mounting grooves in the top of the receiver and is VERY fast.
CONS --
If you're carrying it as a bumming around/ranch carbine and bring it to shoulder, it's quick. If you're thinking more in terms of keeping the rifle at low/high ready, never leaving your shoulder, it's noticbly slower than an AR. More weight out front, more inertia, slower to move.
More importantly.. the darn assembly of the things. To me the Mini is a GREAT idea poorly executed. Once I pulled mine from the stock and saw the coarse work on the internals, and the funky screw-together gas block.. yuck.
In short... it's not a good rifle for the money. If it was in the 300-350 range, about half that of a decent AR, it'd be a great gun within its limitations.. kinda like a SAR.
If Ruger cared to make it a GOOD rifle and redesigned the gas system, gave it a decent barrel, and but a little more work into polishing the operating surfaces, they'd have a good 600 dollar gun.
But right now they're trying to sell a beat up ol' nag for prime race horse prices.
-K