I really like mine. It is the only diesel on my roster.
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It has been converted to battery power. 12V, 1500mah NiMh battery pack, Enhanced Critter Control, and rotary speed setting switch all fit under the hood. The rotary speed setting switch is right behind the horn. Charging jack and power on/off switch have been mounted for easy access on the front of the cab. Turn on the power switch, press the rotary speed switch once, and it accelerates smoothly up to running speed. Lights were changed to LEDs. They are operated by the Critter Control; directional lighting, constant current source. Reed switch for automated station stops hasn't been installed yet (got sidetracked with other projects).
The short time I ran mine on track power, it stalled on my turnouts. Sounds like Dan has the fix for that.
I think the scale fits nicely with 1:22.5 rolling stock. I am pulling cut-down V-dump ore cars with mine.