The new Vision Line GG1 does not have low, medium, or high smoke settings. It is only on or off. The smoke on my #4913 seems more then adequate. I use the newest batch of Lionel Premium Lionel Smoke Fluid and a ZW-L transformer. The newest batch of Lionel Premium Smoke Fluid performs much better than the previous Lionel smoke fluid that I bought earlier this year.
The engine has stalled six times in one hour after stopping the GG1, and the "reset" does nothing. I get "1 Blink" from the Cab light. The only way to get it to work again is to re-program the engine again, and again and again and again.
I did fix the rear pantograph that lost its "Flashing spark". A screw was loose in the box and belonged in the top of the front pantograph. Four of the pantograph screws were loose. One in the rear pantograph was stripped. It's on its way back to Lionel in North Carolina. Hopefully the #4935 won't have these problems when it arrives.