I like the Stewart's as much as my Proto 1000 F'3s. OK, I like my PK 1000 just a little better with them being Monon's, after all I am from Indiana and A and B are powered.
I have been run the Stewart's for around 40 hours now and will say they are getting better with some miles under there belt. The F9 is pulling 22 cars (counting the dummy B) with no real effort. I will guess it will pull 27 or so up my grade, not bad! I will try later and see what the max will be.
One thing I really like is the wires from the trucks to the PC board is much heaver than other engines I have. It looks like real wire!
All so much easier to install a decoder than the PK 1000's I have.
Only thing I do not like is the LED headlight is yellow, but that looks to be a easy fix. Looks like the box that the LED plugs cover will flip open for the change.
Over all I pretty happy with the Stewart's F-9's. Only thing that might stop me from buy another set? I found a pair of PK 1000 Rio Grand F-3's A and B powered (different paint) for $69.99 at K-10 Model Trains.
Any one that wants a Stewart set for $59.99 PM me, K-10 Model Trains still has around 15 sets.
Cuda Ken