My experience so far ordering 2-3 orders each from them over the span of the last 2 months, is that DX is definitely better than KD on shipping, order confirmation, actually sending you a mail verifying what you ordered. KD you get a paypal notice, and that's it, no listing of what you ordered, no shipping notification, nothing.
They both use the HK post office, so I still don't understand why KD takes almost twice as long to get here when they supposedly shipped around the same time frame.
I haven't had to contact DX yet for any problems, so can't comment on the contact portion, but KD I had some problems with stuff that was missing in an order, I eventually got it, but they didn't respond until I was fed up and put in a paypal dispute. I tried all the different listed e-mails, including trying to contact Jerry, no dice.
I still order from KD, but only when they have an item that DX doesn't carry, and I EXPECT it to take twice as long.
DX has actually been pretty consistent so far (knock on wood) for me at around 2 weeks from my order. They definitely don't hurry on the shipping out, but once it's shipped, seems to take about a week.
They even surprised me, when they said they were out of stock on an MTE Q5 AA light, but would be getting back in stock in a few weeks. I decided to backorder it, and color me surprised, it actually shipped a week later, pretty much like a normal order.
They seem to maintain their website a bit better as well. KD put some quick generic descriptions up about Solarforce stuff they are carrying WEEKS ago, and they still haven't corrected the information to be more specific.
But I would also agree with other posters here. If you can get it from another online/local place that is reliable, definitely go that route. However some of the things they carry, you can't really even get anywhere else, or the comparable item would be MUCH more expensive. I think they still need to pay more attention to detail, but then again I don't know how much profit they are really making, since shipping is free on basically any item.
What I have heard is basically, you order something, and wait, you will eventually get it. But I have to admit, I have dealt with some US companies that are even worse customer service wise.
Ciener .22 conversions comes to mind. You are supposed to send him a check (doesn't take CC), he never verifies your order, he doesn't have e-mail, and phone # is very hard to find, and basically does you no good since he won't answer his phone, and won't return your phone call, also won't answer correspondence, fax, or any other type of contact. Numerous BBB complaints about non-response. I made the mistake of not finding out about this before I ordered. He apparently will eventually get you the kit which is nice, but you are basically at his mercy, when/if he ever sends it.
I can say that KD/DX look like customer service GODS compared to this guy, and he is located in Florida.