GalleryofGuns is simply the consumer part of Davidson's. Davidson's is a huge firearms wholesaler/distributor. When you buy through them, you're simply having your local dealer that you chose from those listed order the gun from Davidson's. Those dealer they list set thier profit percentages That same gun is likely available from other distributors and possibly for a better price. You're paying for that warrantee and just how often will a gun manufacturer NOT take care of thier product? If that's worth the extra to you, go with them but it may pay (or save actually) to have you're dealer see what he can get for pricing elsewhere.
There...that said...yes, I have purchased through Davidson's but didn't use thir GalleryofGuns method. Simply had my dealer place the order. Those listed on the site weren't close to me and were actually more than what my dealer was.