I got mine and opened up and tested it out. I have a slightly loose boiler front and the shell seems just a tad loose too. I'll check those screws later.
Other than the stripe color, I wouldn't have taken it from the LHS if I wasn't 100% confident Lionel will be taking care of and I won't comment further on, the engine is beautiful. If I had one complaint, is that as Derek pointed out in his Youtube video, they didn't have road number specific call outs when having the 611's engineer do the recordings. Seems like it would have been a logical choice to do so.
Here are a few pictures with the TMCC 606 and a quick video.
611 on the left. 606 on the right.
606 J from around 2005.
611 "Spirit of Roanoke" 2019