I've been shopping at Yesasia almost exclusively for 6 years now and every transaction has been perfect. The best part: Japan Minis. Its like a special extra treat with every order.
Lucky for you.
As for me, the payment was my major issue, with the nature of my life where I needed to travel between Europe and Asia all the time, it was just not a hassle, but a real nightmare to me when dealing with them because of this. YesAsia only delivered to the PayPal address, so it was really troublesome when I needed the items when I was somewhere else. And my bank always had issues (when I resorted to credit card) with YesAsia because YesAsia was not co-operative enough with the details. When I was in Asia and I wanted my stuffs to be delivered here, just imagine how frustrating it was to communicate with my bank and YesAsia at the same time, just for an order, especially when my bank and PayPal account were all UK based. The international call bills alone were more than the different of prices between YesAsia and the other stores. I mean, of course I could wait for the items if I was like one or two weeks in a place, but no, that was not the nature of my life. Most of the time, I either would be 3 months in Malaysia, then 4 months in UK, then 1 month in Australia, then 1 month back in UK, then 1 month in Korea and so on with other countries. I needed a store which can deliver me the package no matter where I was and no matter which PayPal/credit card I used. YesAsia didn't cut that out for me, contacting and resolving issues regarding payment already took too much of my time, may be for others 3-5 days were OK but not in my case, time was really precious to me, especially with the nature of my life and responsibility.
Now I'm back at my homecountry, no more traveling around, I can put YesAsia back as one of my options once a while, not all the time though as my PayPal and my bank account are still UK based, I still need to borrow my sister's YesAsia account if I need to order something from them. Normally I go there for old items, sometimes they still have them. However, if I can get the items from the individual sellers at Amazon, I'll go with Amazon. Some of the individual sellers at Amazon sell the items really cheap, so even shipping charge is added, the price is still really low.
Not related to this reply, but for rare stuffs, besides Amazon, I also sometimes can find them at http://www.japan-discoveries.com/
, we also can contact them if we want certain official merchandise. Sometimes, they have sales for new items as well.