Personally, I'm skeptical. I mean, more bracing is always better, but i think that will give marginal stiffening of the u-brace, which is already not intrinsically structural (ie not the frame of the car). I removed the u-brace to which it attaches for something like 50lbs weight savings. If i were really concerned with stiffness, I'd get the oswald replacement.
On a related note, a HUGE improvement in stiffness is any of the X-brace substitutes. I did the Home-Depot version of the litespeed Chassis Bridge for something like $15, with half of that going towards buying stuff "just in case" to prevent a return trip to the store. Theres a video where someone removed the bottom anchors of the x-brace and shows video on the track. There is significant movement. I dont know that i noticed it on the track per-se, but it did eliminate lots of creaks when going over an uneven bump (think pulling into a gas station over the curb gradient). Check it out!