“I've been buying from Newegg for about 9 years now (from when I first started doing custom system builds). Their selection is amazing, but what I truly love is the site layout and advanced product searching/viewing. Piecing together a system or just browsing for components is efficient and effective and navigating their site is always a pleasurable experience.
I work for a major Electronics retailer and I utilize Neweggs website on a daily basis in numerous ways, like using their great Power Supply Wattage Calculator to determine what power supply my customers need. I also utilize their detailed product pages for technical specifications when assisting my customers.
What keeps me coming back year after year, after many thousands of dollars spent, is the Customer Service and RMA (return) process and support. I have not had to do many returns over my 9 years with Newegg, but when I do it is always a great experience and Newegg is always fair when processing my returns (note: I have only returned products when defective).
Shipping is the best I have ever experienced with any online retailer. Most items ship free or almost free, especially expensive items. But the best part is the shipping speed - Newegg has a few different national warehouses they ship from, but most of it seems to come from their California warehouse which results in me receiving items in as little as 2 days after submitting an order (I'm in AZ). Their warehouses (and order processing and filling system) are amazingly efficient and automated for quick order processing - items often ship within a couple hours after being submitted.
My overall experience with Newegg is by far the best I've ever had with an online reseller. As long as they continue to provide a superior level of service I will continue to do my business with them and (almost always) them alone.