Interesting you should ask ..
Just done the conversion on mine and my lads last week.
Installed a Nano Tech pack, pushed as far back as it will go, with a sheet of lead under to bring to the same weight as a std lipo. Weight bias is 63% rear compared to a stock 300gm lipo of 61%. And the after running indoors at Caldicot last week I came to the conclusion the I like the set up very much.
More rear traction, better rotation, lighter and more nimble steering .... whats not to like
We will be running outdoors on astro at WORM tomorrow ... ands looking forward to trying the new setup ...