Ive got a job coming up soon with these.Customer wanted these over tiles simply because of no grout to maintain.
Same for me, an elderly customer wanted the whole bathroom doing in along with the PVC T&G panels for the ceiling. The window was a bit of a bugger to work round but make sure you measure just slightly shorter to allow for fitting. If it's oversize you will struggle to get it into the channels.
The only good thing about this stuff is that it goes up pretty quick and there are no grout/mould issues which is great if you are 107 years old!!!