I would have to agree with everyone here on this forum about highly recommending having an agent represent you in your purchase on a new construction home.
1. Builder will pay your agent IF you have your agent sign you in on your first visit to the site. Some site agents will also let you put your agent's name on the form if you just do a "pop in" on your own. Some builders are agent friendly, but some really stick to this rule. Best thing to do is to let the site agent know on your first visit that you have a real estate agent representing you. If they demand that the agent be present, then walk away; if they won't share information freely, it's a red flag.
2. You will have your own representative who will give you an objective opinion on floor plan, upgrades, lot premiums, etc. These are areas where builders have their greatest profit margin and will try to push some to increase their profits. They're in business to make money, right?
3. You will have an agnet who can discuss with you how the choices you make at purchase will affect your re-sale potential (what to spend $$$ on for upgrades and what will not affect your future value). Which upgrades are worth it vs. which ones are not? Which lot is better vs. another?
That said, 90% of the time, a buyer's agent will not appear to do very much for a buyer on new construction. The process goes great, the builder's agent communicates everything, and the process is a lot of fun.
It's that 10% of the time where something goes wrong that, if you don't have an agent, you will wish you did.
Matthew Tennyson, CRS, GRI
Keller Williams Southern Arizona