I tried out that exact kit a little while ago and did not like it at all. Perfectly functional, but all of the components felt very cheaply made and the back bar mount was very heavy. The whole kit felt too heavy to me as well, and added too much weight to the bow.
I'm using a 15" Beestinger Counterslide w/ the dovetail mount now and have no complaints. The bar itself and the mount are reasonably light, and I have 4oz on each end of the bar. Balances out the bow really well, and does an okay job of slowing down pin float; the way I have mine set up the front end of the stab sticks out about 10" in front of the bow.