KB Home is a "mass-market" builder. What I suggest you do is walk through the development and speak with the homeowners. They'll be happy to talk to you about the good, the bad, and the ugly. Focus on how well the company has responded to issues within the warranty period ... after they have your money.
Quality and consistency can vary from site to site because of the different supervisors and subcontractors ... and outside of Houston, pretty much anything goes (building codes don't apply) ... so once under contract, I'd have an independent home inspection done, even though the structure is new (guaranteed the inspector will find things wrong) ... definitely worth the few hundred dollars for the peace of mind it brings. Remember that the salespeople are just that ... they work for the builder, are not required to hold a real estate license, and their sole objective is to sell you a house. In addition, you'd be signing a sales contract written by the builders' attorneys, not the Texas Real Estate Commission ... guess which side it favors.
Because of all this, you need to be represented by a Realtor. The builders' side is well covered, but your best interests are not, when dealing direct. There is no cost to you as a buyer (makes it a no-brainer), although some builders will openly advertise a discount for coming in unrepresented. I can tell you for certain that they're not going to let potential buyers walk, simply because they have someone on their side ... and remember, irrespective of their advertising, everything is negotiable (another reason not to undertake the largest purchase of your life without an advocate).
I'd love to work with you. Let's take a walk through the development and get some homeowners' feedback. Looking forward to hearing from you ...