I bought my present SFH new in 2004 from a custom builder who was building on a vacant lot in an established neighborhood on speculation. While certain aspects of my home do not seem at all "custom" to me, more builder's grade, I think over all I am satisfied with my purchase. I wanted something new, as I did not feel that I could keep up with the maintenance on an older home after my husband passed away. By the time this place starts falling apart, it will be time to move again.
I have not needed a plumber or electrician or handyman of any sort since I moved in, so it must be pretty sound. I have not seen any cracks in the foundation or garage due to settling either. I have noticed a few things like my master bath vanity has a small gap now between the counter and the wall and there is some caulking that is needed on the baseboard running up the staircase. Some things I would alter after having lived in the space for awhile, mostly layout issues...my mudroom is too small (door hits my dryer), I have a stupidly located downstairs powder room that is practically in the dining room, I would have placed some electrical outlets differently. I would have designed the front entrance so that there isn't a long narrow window next to the door. Oh, and I don't like that my upstairs does not have a separate thermostat. I find that my air conditioning is sort of scant in the summer up there while the downstairs is freezing. I overlooked a lot of these things in my haste to close and move in as my previous home was sold. But all in all a fairly well built house. Factors that figured heavily in my selection of this home were location close to work, nearby shopping, no neighbors across the street or behind me, a nice level lot, established neighborhood with trees, and lower price compared to similar new construction that I saw (almost all of the others were in new housing tracts which I wasn't crazy about).