Hi there, these are truly fabulous little engines- so much so, I purchased TWO- one of each colour!
However, they are NOT set up correctly at the factory to Hit and Miss, as they should..
But with a little patience, tge governor spring behind the latch arm can be shortened, so they run correctly!
It's mot a big job, just something that requires patience.
I enjoyed modifying mine, and I personally prefer these engines over the eachine models- but as a word of caution, spare parts DO NOT seem to be readily available, like the eachine engines, where spares seem to be plentiful..
So bear that in mind, before you make a purchase, of these great and very realistic little engines.
Ease of use 10/10
Value for money 10/10
Spare parts.. 2/10