I am not much of a chassis guy, but can say that at matches I attend, a good 30% or more are shooting some variation of this complete rifle or chassis. And people are winning with them. As to balance, depending upon the barrel profile and length you use, you can buy weight kits for either the forearm or the buttstock, so there's never really a reason that you should be unbalanced using this system.
Even being a dyed-in-the-wool stock guy, I admire this design and company.