I myself have owned William Lyon homes and was very happy with them. I have not in all the years I have been in the RE Field heard anything derogatory about his homes.
Check out the home you choosecarefully for the quality of the construction and all the upgrades.
If you are buying a new home the builder usually has a list of the brands they use for their construction. Ask what brands of windows, sinks, fixtures ect. that they use. Then check that out for yourself.
Best of luck to you,
Prudential CA Realty