My experience with them so far:
I've made two orders that were shipped within 5 days of placing the order and arrived within 3-4 weeks after shipments.
They were small ones (silicone grease, rare earth magnets, cheap uv "detector") and everything I ordered was received.
I now ordered a multimeter and an AC tester with a tracking number, but although it was shipped the customer support says they did not get the tracking number from the post company. They said they'll resend the order, to which I responded that it was only a week since shipment and the package may still arrive, but they insisted on sending another one. Never had that happen before, I'm not sure if I like it or not.
Anyway, I'll have to wait and see how it goes.
About the store in general:
They have a huge variety of products, some are unique to them (in the eBay/Chinese/HK online stores market, at least).
Many electronic parts (resistors, capacitors, IC, etc.) and many electronic devices (like drivers, signal generators), o-rings of many sizes, many many kinds of multimeters (UNI-T, Mastech, Minipa, Vichy and more higher end Chinese makers) and oscilloscopes (Atten, Rigol, UNI-T, etc.), all kinds of DIY gear (soldering stations, plastic boxes for parts, other equipment) and generally just about anything you'd need for DIY projects.
They also have a large variety of flashlights, but this is not their strong point - older models, high prices.
Product descriptions:
They have good descriptions for their products, seem to cover all interesting specs for most of the products.
Customer service:
Their support system is not very responsive.
Two emails I've sent went unanswered in the last week (regarding the tracking number issue), and I needed two chats with the live MSN Messenger representative to get the answer "we didn't receive the tracking number at all".
But they do give answers eventually.
Prices:
Generally they're not the cheapest (although many times they are, compared using NGshopping and eBay), but not very far from being ones.
Flashlights prices are unusually high (e.g. a "DX C30" costs about 17$ while most stores sell it for 10$ or less).
Coupons/sales/bonuses:
They don't have any working coupons to the best of my knowledge and I haven't seen any sale yet.
Some items have a 1% discount, so not much here either.
Bulk rates are about 4% discount for 5 items, 7% for 20, 9% for 50, 11% for 100+. Not great either.
They have a points system where you get a point for every ~10$ you buy, but can also get free points by a luck draw where you can get 1,2,10,50 or 1000 points depending on the numbers you get from a random number generator. A point is worth ~0.10$, and the luck draw is free to use, so it's worth using it every day whether you intend to buy or not. I already saved a couple bucks with that.
Regarding the customer details exposure that Don witnessed:
I haven't witnessed any mixup in customer data as Don has reported above. I tried to watch other orders (input another order number in the URL) but couldn't see any other than my own, so maybe they fixed this glitch. However, they do expose the customers names and place of living and how many points they won in the luck draw results, but this is not connected to any account.
Summary:
I'm very pleased by the variety of items, prices are good, customer service is good when they respond.
This looks like it could be one of my favourite stores.