Refuse to comply with the German right of withdrawal
Apart from the partly problematic waiting time for shipments due to a very poorly implemented online shop (that shows articles as available, then they aren't), the main problem I have is the customer service and their behaviour with regards to the returning of items.
Within Germany, as a customer I have the right to return ordered items within 14 days, regardless of them being opened or not. Nolae refuses to honor that law and classifies opened lightstick boxes the same as i.e. hygienic products, effectively saying they cannot be returned. This is a known issue with smaller shops, but still annoys me to the core.
As a buyer, make sure you know what you want - you cannot send the stuff back! Probably order your merch at imusic, they are a lot cheaper anyways (and do serious business at least).