My experience with K's years ago was piss poor (and I do believe I still have the emails to prove it).
Bought a high speed, it was messed up, had some battery damage sound didn't work. (I had no clue the issue, it was my first machine).
Sent board out for repair to him.
In the meantime I bought a refurb on ebay that was from coin op cauldron that worked great.
Board comes back, I leave it in box for a few month since I didn't need it.
I then buy a cyclone that needs minor board work, send that to him (which he did fix, then I resent him the high speed board)
I take the sys11 board out of the box reinstall in high speed and proceed to put the 11A in cyclone.
Well, the original sys11 that I had repaired, does not work.
Send it back to K's.
He then proceeds to tell me he never worked on it and it he would never let a board in his shop like that.
Umm, I only had one freakin machine when I sent it to him, I have the printed receipt and the paypal receipt.
Basically treated me like I switched the board on him.
Then refuses to send it back to me, says I can have a $100 credit with him, but no refund and no board.
I Let it go back then, but I would absolutely NOT today.

I also vowed I would tell this story every time someone asks about him.
Edit: I just looked up the emails, he said at one point I must have just asked him to "patch it up", because it still had the bad battery holder on it.
I knew NOTHING about pinball at the time. I left it up to his discretion.
I do still have the paypal bills, $145 for one board and $160 for the other.
I guess the good thing that came out of it, was I learned with the help of pinside to just fix my own damn stuff.
And if I really need work done (because I don't do battery damage), send it to chris hibler.

He's like a health insurance company, deny, deny, deny and hope you go away (or maybe worse, die).
Which is what I did, I was a noob and let it go.
Won't happen again.
Telltale sign would have been he left the original battery holder on my board.

Go back a handful of posts, I had the same experience. Except I paid him to fix mine (it didn't work when I got it back) resent it to him and he said he didn't do it and he kept the board.