[BrianG]

Yeah, there are several reports of thermal issues, but you have to remember many people only post the bad stuff. There are tons out there that work great but those people don't rush out here to post "Hey guys, the ESC is working". As with ANYTHING, there will always be a few instances of issues, but that's par for the course. That's what the warranty is for. And from the few reports I've seen, Quarks customer service is very good. So, it's not like you bought a no-name device from an electronics liquidation fair with no warranty and hope it works...

The only weakness that I have seen is the overheating and the trouble running at 6s. I've never actually had it thermal even before I did the cooling mod - I just did it because I like my electronics to run as cool as possible. And I only plan to run at 5s max, so that's not a problem for me. I'm just glad Quark provided a nice flat area to mount an external heatsink. Most ESCs have a small finned one already mounted that you can't remove, so the only way to cool better is to use a fan.

Just looking at the internals, you can see the Quarks are built well. Everything is laid out neatly and it makes sense (from an electronics perspective).