Quoted from NPO:

Good for you holding to your guns on this one, Grys.
I have said this many times before, and I'll echo it every time I see it - that board is a band-aid. It is a SOLID band-aid for most people's reset issues, and it'll help get your game around the issue for a long time if your reset issue isn't too bad. I speak from personal experience: it is not the "end all be all, never have a problem again" fix. My TAF was resetting badly, and I installed one, and it STILL reset. I wanted to install the magic bullet and see it all better, but in my world, that didn't happen.
When rKahr and I discussed the possibilities, he informed me that would be due to the 12V line on the power driver board being weak too. So, if you install one, and your 12V is already weak, and that's where the Kahr board draws from, guess what's going to happen.........?
I'm sure for operators who want to just get their game back on their feet and have machines all over town to keep running, this is a nice option - and that's awesome. I am just letting you know - from hands-on experience - your reset issue is bad enough - even that magic bullet is not going to stop it. Then you'll end up doing what you should have done the first time: address it by fixing the original problem.
It's a great product, and awesome for what it does. Use it to get through a get-together, party, pinball leauge tournament day - but DO NOT depend on it for the long haul. Sooner or later, the electrical gremlin will return.