Not great
I ordered from Appelboom two times, both times items the website said were in stock turned out not to be. One order was slow but arrived within a month. The other I cancelled after five months of waiting and receiving no updates, even after explicitly asking about the expected delivery time they would only say 'still waiting'. They do not appear to know if or when items are or will be in stock. They were quick to give a refund, but I would not order from them again as there's no way to know or find out when your order will ship.