Having gone through pretty much every single post on this topic and having ordered camera gear from Adorama (3 times in 2013 for a total of US$ 3981.02), this is my feedback:
1. Adorama is not as prompt or as professional as other online stores I use (i.e. B&H, Amazon, DigitalRev etc) ... when I order anything from B&H, Amazon, DigitalRevv, Yongnuostore etc, I get an email immediately after I place the order (it takes maybe 20 or 30 seconds to get an email from all the other online stores I shop from) ... but with Adorama it takes almost a day to send the email ... for my first order this year, Adorama did not even bother to send me an email with my order details till date (I had to send them 2 emails reminding them of it and finally they send an email saying "Hi, Thank you for contacting Adorama. Your package shipped via UPS International. Your package shipped out on: 2/27/13 Your tracking number is: 1xxxxxxxxxxx7859" ... for proof, see the attached pdf titled "Attachment 1" ... as you can see there wasn't even an apology for their tardiness ... I know an apology is not going to change what has already happened but for me a lack of apology from a seller, especially for their tardiness, reflects an "I don't care" attitude).
2. Adorama does not display their items being out of stock until you add it to the cart ... B&H, Amazon and pretty much every single online store clearly state, "out of stock" info even before you add the item to the cart.
I think both of the above issues are easily fixable by Adorama but for some reason they do not and I don't understand why.
On one occasion (earlier this year) Adorama website did not even mention that the item was out of stock even after I added the item to the cart ... after paying for the item it took Adorama a day to send me an email stating that one of the items I ordered is out of stock and they gave me the option to cancel the order (... for proof, see the attached pdf titled "Attachment 2"). This may seem like a small issue but for people like me, who are ordering from another country (in my case Qatar), banks hold the full purchase order price as soon as we order the items and if I cancel the order (even it is on account of the seller's fault) it takes a long time to get the money credited back to my credit card (in Qatar it takes minimum 45 days to max 90 days), meanwhile we have to pay interest for the money we did not even spend ... if we don't want to pay interest we have pay up the full ordered amount to the bank i.e. make double payment for an item we did not even get.
Having said that it is heartening to see Helen (from Adorama Customer Service) is actively participating in this forum and addressing customer complaints ... I hope she will be successful in fixing the above two issues, i.e.:
a. send an email (with the order details) to the customer as soon as a purchase has been made.
b. display out of stock items clearly even before it is added to the cart (but for God's sake definitely before the purchase is made).
PS. In my case I do not consider my experience with Adorama "horrible" but definitely not up to the mark as other online stores I use, not even those that are much smaller than Adorama ... so I now only use Adorama for Nikon or any other gear that is not available (or not shipped to my country) from my preferred stores such as B&H (USA), DigitalRev (HKG), Amazon (US, UK & Japan), Yongnuostore (China) etc.
But I've never had any problems with any of the items I received from Adorama ... so not complaint there.