Has anyone bought from Rakuten? Is it reliable?

Lotte is quite reliable. Lotte is a large Korean group and it is impossible to sell fake products. You can rest assured that they are all genuine products! I just went and bought a bunch of them at the end of last month, and they were tax-free. Moreover, online duty-free shops do not require store fees, so they are cheaper. Most international brands are cheaper than those in Hong Kong. Moreover, you can pick up the goods after entering customs at the airport, so you don’t need to remember the weight of your luggage and there is no capacity limit.