Our coach has one half of the power bed option. We have the power bed on the passenger side and had them build a small dinette on the driver side. With the bed retracted it works as a day bed or sofa and the aisle is full width. At night it extends to a 'full' size mattress (54" x 74" i think) and there is a narrow aisle to the bathroom. The aisle is about 8", tight but it works.
I can say the mechanism works fine, we have had no problems with it. The one downside is that you need to make up the bed every day to retract it. Not a problem for us but some might prefer a permanent bed.
We ordered a cover to match the curtains, like shown in the original video for the mattress and cushions. When retracted it looks just like a sofa, not a bed and the extra cushions make a nice back.
Here is ours retracted and extended.