Worth upgrading from a 9920 to a Quark 125?

[Rtsbasic]

Hey guys, just hoping to get some opinions on the Quark 125, now its been out long enough for you guys to form some opinions :) I'm currently running a 9920 in my Savage, but I'm thinking of upgrading. Do you guys think it would be worthwhile to upgrade to the Quark? I'm hoping it would reduce the heat, have less cogging on pullaway and mount nicer because the solid case. The target vehicle is my Savage, which runs quite happily with my 9XL on 12-14 cells. I don't plan to bump the voltage higher than this, 16 cells or 5s possibly in the future.

Also, whats the support like with Quarks, if they break or become damaged? Anyone had any experience with returning damaged units to them? This is always a big factor I take into consideration when purchasing a new ESC.

Was also thinking of putting a Mamba in there..read of a couple of people putting them in 1/8 buggies okay, but I think a Savage will overstress it? CC gave me the unoffical go-ahead to run upto 16 cells on one, concerned it'd overheat too easily with a 9XL/14 cells though?