Accurate Flooring & Countertops

The owner came out, measured, and gave me a sq. ft. installed price that was competitive with some of the other fabricators that I had talked to, not the lowest price by the way but within my modest budget. They were able to get a particular stone that I wanted so that clinched the deal. He was, throughout this purchase and installation, always pleasant and polite.
I wanted a honed finish on the stone: he first quoted me double what anyone else had for honing, but then he did agree to match the pricing from other stone yards for that finish.
I had to wait many weeks for him to template and be ready to install. Whoops, he suddenly discovered that my walls were not straight! In a 75 year old house that he had already seen and taken measurements before quoting — Well, that would be an extra $ 200 to scribe the stone to the wall (I do not understand why every fabricator makes a template if they expect the walls to be straight and not have to cut the stone to fit…).
He then asked if I wanted an «enhancing» sealer on the stone — explaining that the stone would be darkened by it. I told him «NO» because the color of the stone, as it was, was just what I was after.
Installation day: he had applied the enhancer to the stone anyway. It changed the color of the stone from grey-​green to gray-​black. The seam was not well color matched to the stone, much lighter, unexpectedly wide and very visible. I would guess that he had mixed it to match the original color of the stone. When I asked him if it could be improved, he said «NO». He told me that it would darken as it cured. The edge along the wall, that I had paid extra to have the stone fit, varies from 1/​16″ to nearly 3/​8″ gaps (I have seen example of other installer’s work that is closer, including much narrower seams, so, I don’t understand just what I paid the extra $ 200 for), filled with BRIGHT WHITE caulk. The stone is dark and the walls were not going to be white. He told me that I would need to paint the caulk to blend it in. Colored caulk is readily available, by the way. UPDATE AT JUST ABOUT 2 YEARS LATER: the caulk is starting to fail (gap and crack) at points. Shouldn’t it last longer?
Also, he attached the undermount sink to the counter with caulk only. My cabinet guys told me that they have to redo that sort of installation often because they fail. Clips or a harness should be used. I am purchasing a harness device to secure the sink myself.
After some time when it became obvious that the seam material was NOT going to darken, I asked him to come back and make it better, and to try to remove the enhancing sealer. To his credit, he did come back: the seam is much less visible now, which is why I originally gave an A-​OK rating, but his effort to remove the enhancer only produced a subtle restoration toward the original color. Plus he skipped one section of counter entirely so it is visibly darker than the rest (although as it is subtle, most wouldn’t notice).
So, I would say that his work is just barely okay, definitely not top quality, and left me somewhat disappointed with my countertop.
Apparently the honing and edge scribing was done by the yard where he got the stone, Mees Distributors. So I can’t be sure if the uneven scribe is their error (careless work) or his (bad template).