http://www.rc-monster.com/brushlesscontrollers.php
Zcrusher, they are still a pretty new company, and I haven't heard of anyone needing to send their Quark controllers in for replacement. I do know that two guys that work for Quark have been on the RCCA forums. One of them lives near me and I might be able to meet him in a couple of weeks.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz