Friendly, but quality of work is questionable.
I used this company last year. They were kind and friendly, however a couple of months after they put in a new kitchen faucet, the thingy that is screwed to the sink that keeps the hose and spray from moving around, came off.
I also had Arrowhead put in a toilet after I was told (I think I spoke with Derrick) to get my old one replaced because it was constantly running. I was told that it would cost about the same to replace or repair the old one. About a month later, another plumber had to fix my toilet upstairs because of the same issue. This plumber told me that usually the toilet does not need to be replaced unless it was physically damaged. Only the inside parts of a toilet needed to be changed, which was A LOT cheaper.
I also did not like to caulk that was used by Arrowhead around the toilet that they replaced. It became discolored, making my toilet look bad, even when it is cleaned everyday. That (along with the loose hose and spray) is why I decided to use another company. (I am very happy with the new company by the way.)
Overall I cannot say anything bad about Arrowhead's customer service, but as far as their workmanship quality and questionable suggestion, I had to give them an overall score of 2 stars.