I concur with Geoff, "If it ain't broke,...don't fix it!"
Haven't bothered doing a firmware flash, but I guess if one wants to revert, there's the original here;
http://www.ff3dp.com/#!download/c58h
ReplicatorG may not be the fastest or latest "bling(?)" on the block, but in my (2 month experience?) the stock FW seems pretty reliable..not doing production..hobby only.
Cheers!
TD