Surprisingly good, especially considering the price. We needed to blackout our laundry room for our early waking puppy and despite it saying it only blocks 90% of light, it really doesn’t let any through at all.
Took about half an hour to cover the doors including washing them first. Instruction video is useful. You really do need the spray bottle and squeegee. Cutting didn’t go so well and I wish I’d left a bit more at the edge - if even a tiny bit of light comes through it makes any rough edges look really obvious.
It’s only been up 24 hours so can’t comment on longevity but the installation and effect is great. Delivered within 2 days too.