I had considered a rectifier, but for the price of the MRC transformer, thought I'd give it a shot.
Hooked it up to a test track and it works great with my Bachmann 4-6-0. I've been in 3-rail a long time. It's hard to get used to using the direction button! I keep lowering the voltage to 0 then raising it thinking I'm going to be in neutral...
Love the momentum and "feel" of the transformer.
I'm just doing an 8 foot shelf layout with the mainline dropping into my current layout, so don't need massive power.
My current On30 layout: