I'm considering pre-ordering one of these to pull my set of 20" Williams Amtrak Superliners (upgraded with constant voltage LED lighting). My Amtrak Dash-9 with TMCC (upgraded with CC-M) was pulling them but recently took a tumble off the layout due to a crossover switch pair being thrown incorrectly and is not functional after that fall.
I've been very happy with my LC+2.0 Big Boy and Charles Ro has a really nice pre-order price for the Genesis. I know it's shorter than the MTH/Williams models and I'm mostly concerned it might look silly to have a 14.5" loco pulling a string of 20" cars. As a comparison, the Dash-9 was about 18"