I've noticed more this year, that clay pots have dried out far too quickly, whereas brown/black plastic pots are just fine!
I can't remember who recommended them on TV some years ago, but after a few years 'in the dirt', they look the same at a distance anyway, so we'll plough on with the odd new one now and then!
Plastic raised beds could also have the benefit of retaining a bit more moisture, whereas timber sections - as you say - don't last forever, and still get wet, with a decent coat of protection or not! These look pretty good!