My first quad was a diatone 250mm frame & they where great little runners on 3S then when I got 4S esc's I was hesitant to try the 4 but they where fine.
Not much more power, just a little more responsive. A sound little motor that have been on plenty of frames & a few knocks but still working. Bearings OK I got oil there incase but never had to.
Only gripe is the prop shafts are a bit short for some props. They can run the Dal cyclone V2 but stick with the old style dual blade for your first few hours. You will probably go through a few.
And they should be pretty cheap now.
Even on 4s they feel loose, more skatey than the tri blade. I find most dual blade props are better for straight line speed.
Tri's have more bite on cornering.
