I have a Ryan townhome that was built 5 years ago. The minor issues I have I think I would've had with any builder.
I did find it nice that I could add or delete some options. Getting the appliances for $50 was a nice plus (an option they offered at the time). We opted to have the morning room bump out and deleted the finished basement because we did not like their layout. Five years later, basement still isn't finished, but when I go into my neighbor's basements, I'm glad we didn't!
In my neighborhood (planned, yuck), there were initially six builders. One of the other townhome builders did a horrible job. I would look out my back window at the other townhouses and see siding coming off of them, six months after being built! It wasn't a big surprise that half of them were still unsold after they were done. My block had all houses sold before being built and a year later, there were still 2 empty houses on that block.
Good luck with your house hunting!
Suzanne