Do You Use Euro Pillow Sham Covers?

I've noticed that euro pillow sham covers seem to be popular for making a bed look more finished, but I'm wondering how practical they really are for everyday use.

If you have them, do you actually keep them on your bed all the time, or are they mostly for decoration? Are they comfortable enough to lean against when reading or watching TV?

I'm also curious about the best fabric choices. Do some materials stay looking nice longer than others? And how often do you wash them compared to your regular pillowcases?

I'd love to hear what has worked well for you and if there are any tips for choosing good quality euro pillow sham covers.