I like the site a bit. Sure, it takes forever to arrive (though sometimes not), but then again I don't have to pay for the shipping from Hong Kong. If I want it a week earlier, I can pay for EMS. They also break up orders if some are delayed, which is nice. Their customer service has been good to me, and they've always been fair and upfront if a defective or wrong item was sent. They also pay to have it sent back if that is needed (though they just let me keep the defective/wrong items in my case).
I just love the fact that I can get relatively exotic parts for super cheap. I remember paying like $30 for an flashlight LED + lens + buck through some "local" online shops, whereas I could get the same thing from them, and better, for half that--no shipping. I'm just waiting for them to eventually sell electronic parts in addition to their gadgets.
Laser quality: sure some aren't as good, but what do you expect from a laser claiming 200mW in a laser pointer case? I have a 5mW laser in that case and it gets warm relatively quickly too. Still, if you're willing to have a short duty cycle, you have a ~200mW laser--for $120. Impress your friends with that rating, and then when you want something you can keep on longer, invest in a Nova. The 30mW ones are great "starter" lasers at $20-$25, and I love that many are easy to take apart so I can use the cases or lasers in other projects. Just try getting these raw green laser modules for this kind of price anywhere else.
Finally, if there's one thing that makes DX great it is their product pages. They have good photos, user photos, and videos of the products. Their reviews and comments section for their products are also very helpful and good. They don't censor anything besides links to competitors or abusive posts, and even respond to questions. Even if you don't buy anything, it's nice to be able to get a full picture of what's for sale. It's a reason why sites like Newegg.com do so well: good prices, but also good product pages so you know what you're getting.
Bottom-line: it's as good as it gets when it comes to an overseas online company selling exotic gadgets. Just have patience with your order; it does take a while to arrive.