it will cost the shipping charge and I believe it's about 50.00 repair fee(unless under warranty, then call and I think they pay for it all)
I myself ripped the button off, but then again I also bought the castle MMP instead so I didnt care if it was no longer waterproof. It then came out of my slash and now sits on a shelf with the rest of garbage electronic's just in-case I have issues with the castle..."Knock on wood"
The VXL is the most BS ESC I have found in all my years of racing and building RC's, the first VXL I had died after the first week of owning the darn thing... got it replaced for free but just about right after I had received the new one the button failed. I do know of a few ppl that race here that have had MANY issues with the VXL-3 ESC and vow never to use them again.... Go with castle