Now the negatives:
After 2 days, an engine has failed and no longer works. I have contacted the Super Mario store. First I should get a replacement engine (how am I to change?), Then I was able to return the unit. The return on erffolgte own costs (16,90 EUR to England). After some back and forth I got at least refund the purchase price. The postage is not taken over by Super Mario store ("we have been 10 EUR paid for the delivery - Please understand").
Conclusion: Next order directly from Amazon, since there are no problems with returning there.