Some of the first Legacy w/ Bluetooth diesel engines have a code bug where the engine won't ramp using a Bluetooth controller like the Universal Remote. So you have to use a Legacy controller to get that functionality. That has seen be fixed in the code.
The new release CW-80 will have redesigned electronics that will be based on the PH180 electronics, so it'll be a stout little transformer. But if you ever want to run more than 1 engine, I would suggest going right to a GW180, PH180, or hey, get a ZW-L!