I had a BMI TC4 and ran another touring car and now have FT TC4. Very similiar. Batteries on the BMIare moved forward some. The FT has a nice setup with alum camber link mounts and non cam style motor mount. I like the spine setup for the FT and especially if you race carpet.
If you already have a decked out Team TC4 then a BMi setup might be nice to have since you need no hopups but if your starting new then the FT TC4 is a better deal.
I liked my BMI version so if the FT TC4 version works as nice as my BMI did then I will be happy.