I'm not sure if I really want a wall of sliding doors for the master bedroom as I will probably want it closed most of the time, especially when there's guests. It's definitely fine for the 2nd bedroom as those are often used as a den or as a rarely used guest bedroom and opening that room up would make the living space feel more spacious, or even expanding the living rooms into this space.
In general I would prefer to have the walk-in shower in the master bath and the tub in the second bathroom as the shower is used much more often and showering in a walk-in shower is much more appreciated than showering in a tub.
How much is the M09 model at the Mercer selling for? I don't find the unit that great and it's next to the trash chute.
I agree that having 2 full bathrooms is excessive for a 1+1. I'd rather have only one bathroom and have larger living areas instead, or at least have a powder room for those occasional guests. And having two doors to a bathroom is a waste of space and awkward. Having direct access between a 2nd bedroom to a bathroom is not necessary and wastes wall space limiting furniture placement.
mercer is going for $435K I believe. Only 3rd floor available. The location of the unit is a bit of a problem. Pretty much agree with what you said, especially about the shower. Would rather the tub+shower over tub+tub.