I was looking at those as an option too. The primary thing is a set of FLM's cost around $60, a set of those cost around $100. If I read enough opinions that almost twice the cost is worth it for the Maximizers then I will go for it. I have been upgrading my emaxx over the past year so I can eventually go brushless with few to no worries about durability. My current configuration is as follows:

Xtreme carbon chassis standard (they did not have the brushless version when I originally bought this)
GA bulks and bulk braces front and rear
GA ti skid plates front and rear
UE idler gears
CVDs front and rear
Robinson slipper kit with 72 spur gear
stainless steel hex screws throughout
Everything else is stock

I plan on upgrading the diffs and CVDs for the center next before buying one of the brushless motor and ESC setups. Someday I may get a gorillamaxx chassis and suspension to replace my current.