First, if you have done your research, most RTA cabinets are manufactured by the same company and retailed by different sites. So any complaint regarding cabinet quality would be the same no matter where you went.
Which means you are really looking for price and service when purchasing online. The Depot offered great customer service. They may not offer the instanT automated chat gratification we have become use to, but their "human" c.s. is very good, and the quality and turn around on their ticket system is excellent. Which leaves price. I shopped 5 other cabinet companies all with the same product line. KCP had the lowest prices. They offer an online discount all the time, versus other companies supposed sales. Their everyday discount is lower then all 5 of the other companies sale prices. So if you are looking for the best price and the customer service to back it. KCD SHOULD BE YOUR CHOICE!