I have a Q2 that I bought on ebay years ago. It had a busted drawbar, which I made a new one out of brass stock. It works great and as mentioned before runs beautifully. I will say like a well oiled sewing machine, very smooth. It only has the QSI sound, which for me is enough.
Looking to get a T1 (probably Lionel) as I really like that version and had one before.
Al