Yeh, my contractor has been building houses since 1960. My wife works with several people that he built homes for and they were very happy with their home. We also know several other people that have built with them and were very satisfied. Our builder is also very proud about the number of "repeat" customers they have where people/families have built with them several times. They are a really good, hardworking, and honest family run outfit.
Our house is...semi custom. We went with a floorplan he built in the past and switched up about 20% of it for different measurements or layouts here & there. We also had full control on window placements, colors, exterior material, cabinets, floorcovering, ect.
As for the radiant...yeh it was a lot of work. Took about 60 manhours when you factor in me, my Dad, and my wife's efforts. But today we had both the builder and the concrete guy come in and inspect before pouring and both said "you guys did a great job". The concrete guy said that it was even better than a lot of "paid professionals" have done at some sites they poured at.
It's three "loops" of 500 feet. Will be one big "zone" since it's all just one big slab it's in. It's naturally laid out in a manner that will be easy to control. One zone doesn't even need to be turned on, but it's plumbed for it if we want to. I'll be running a second zone up to my master bath on the main floor to keep the tile floor and shower warm.
For those asking, I'm building in central, IL.