I agree with mike for the most part, but I honestly prefer the ACR the more I shoot it. Just bought the ACR some unicorn parts last night, can't wait to show em off!
The ACR handles fine even being the polar oposite for weight distribution of the Tavor. While the ACR is slower in snap shooting, the forward weight of the ACR steadies your aim for distance shooting while standing or kneeling with wind pushing your sights around.
If you are careful about your choices of handgaurds and barrels for NR length. Puting any accessories forward of the magwell will damage your chances of being happy with the weight balance. Only things forward of the magwell on mine are the ACR MOE polymer handgaurd, Surefire Scout 600u on a Magpul MOE scout light mount, Surefire SR-07 rail switch, and a Troy folding battle sight. This makes a very manageable weight.
Did you buy that limited run of ACR handguard from acrforum or something?
I would've jump on that if I had an ACR. Frik'in ###y