Now I can keep heat-generating stuff like my storage server and the cable modem (surprisingly heat-intensive) in the basement, have a WiFi AP in the attic for great coverage in the yard, and I can easily drop lines down into rooms on the 2nd floor from above by just drilling a small hole in the top of a wall and feeding the Cat6 down, or put one into a 1st floor room by going up from the basement. Cat6 anywhere I want it, basically.
It's something I've wanted for years and held off doing because I knew I was capable of DIYing it, and therefore I hesitated to hire it out. This was dumb.
It took him an hour or so using various specialized tools ("fish bits", "fish tape", tall ladders, drywall saws, etc.), when it would have probably taken me the better part of a weekend and I wouldn't have done as clean of a job. He also knew from experience where the easiest place would be to get all the way from the basement to the attic, given my house's construction style.
Definitely worth the two bills, and also now I have a "wiring guy" for future projects. I've already called him back to help run wiring for PoE outdoor cameras, another thing I've wanted for years but haven't bothered to execute on.
