http://www.rctech.net/forum/7971548-post2409.html

Just got my 12r5.1 Lipo chassis. I'm really impressed with the quality of this CF, and I am really picky. I did some brief comparisons between the regular 12r5.1 chassis and this new and improved one. Here's the break down . . .

-Both are 2.5 mm thick
-Stock is 50g vs 58g for the lipo version (its nice to have the weight down low)
-The new chassis is drilled for both the popular JR and Futaba servos
-The new chassis is drilled to locate the servo 3 mm farther forward, where I normally locate my servo anyway with spacers.
-The new chassis widens the front end out about 2mm for stability.
-It looks like the new chassis is drilled to accept CRC lipo locators and allow you to move the battery fore/aft.
-There is a center hole drilled at the rear of the main chassis for those who like to balance just the chassis.
-The new chassis is about 3 mm narrower than the stock chassis without adjusting the geometry.

Can't wait to get some electronics in this thing and see it carving up the carpet.