[gixxer]

rc caractions new on it list the RX8 as Dimensions: 1.5 x 2.2 x 1.4"
Weight Approx: 2.7oz

tower has the Mamba Monster listed as
Size: 2.2 x 1.9 x 1.4" (56 x 48 x 35mm)
Weight: 4.3oz (121g)

so its smaller but maybe not as much as some of us would hope for. should make a difference in a buggy though.