Hi and welcome to the forum.
If you're speaking of the Tru Center system... I think recent reviews here on them have been glowing.
They had quality problems when the product first came out but it seems that those have been fixed and customers now seem to be really happy with them.
I use a different brand and it made a world of difference in the handling of my 40DP but the "adjust on the fly" feature of the Tru Center is something I'm really envious of.
Feel free to use our search feature and you'll find a lot of material on the good, the bad and the ugly... but at this point I think it's all good.
Best of luck.