There is a official LSP thread on here somewhere...
Alloy arms are great, but do add considerable weight to the Truggy, some guys revert back to the plastic one's at my club.
My only whines with the LSP are the droop screws, they tend to dig into the chassis quite a fair bit.
To make it a race winner upgrade..
-to 17mm hubs
-add a front brace from the Lightning Pro
-upgrade to a 150cc fuel tank, the Kyosho one drops straight in and allows space for a second front brace.
-run the diffs with a 7000-10,000-3000 ratio, makes a big difference. (F-C-R)
-buy a better pipe, stock one is only for bashing

Theres 4 LSP's at my club and they often win against MBX's, 8T's, Hellfires and Hong Nor CRT's.