I have a review of the Megan braces posted also.
Megan H-Brace and lower rear brace Review
The Megan lower front h-brace and lower rear tie bar did help tighten up the chassis. The did make the chassis stiffer. Not as noticable a mod on a stock suspension, but with my coil overs and my current setup it was noticable. Not a recommended first mod but definately helps.