I'm on the yellow ray-gun stuff too, I've only ever managed to burn a drill armature out (but then I was using a 20mm carbide hole saw on 10mm steel plate so it's my own fault), found a replacement armature for £26 and it was easy to fit.

I also have the 9Ah monster dewalt battery and their usb topper, absolute life saver if you're on a job site, or going camping.

I heard they've released an even bigger one which I'm yet to look at, and they have a power station thing that looks cool as hell.