Motor boats for small or large Playmobil ... it works! Depending on the size and weight of the vessel there will be a difference in speed but in all cases it advance ... the rubber seal does not provide a perfect seal but that does not seem too géner and the engine works very well (there was a little white fat in the thread to complete the seal and I understand why).
Very decent life: this should do well 2h of use since I put the battery and I have not changed.
note: I have read some comments or geniuses / complainers complain about a design flaw that would set back the boat instead of advancing. Solution: just put the battery in the SENSE! :-)
