Not to be trusted. Rip off.
This guy quoted me a price per foot, based on my (somewhat high, I thought) estimate of footage. My estimate was high, though I did nto have time to measure. He then billed me at a higher rate, and for a larger number of feet of gutter than my house has, according to my after-the-fact measurements. And the difference was not small. My house is large, but nearly square, so the gutters are not that big. I ended up[ spending over $200 for a job that should have cost under $100. Avoid this scammer. If you must use him, get an estimate in writing, and hold him to it. You'll need to.
In addition, the cleaning job he did was not great. Apart from the scattered gunk all over the deck, which I expected him to spray off, the gutters still had a lot of mess when I had them replaced shortly thereafter. I had initially asked this guy to just look, for an agreed upon fee of $100, and clean if necessary. he just cleaned and didn't look. The gutters desperately needed repair, and he said nothing. I would use anyone but this guy. The ONLY thing I'll say in his favor is that I asked him if he could get it done quickly and he did.