I don't see the point of Clever. It just seems to be a portal with links set up by the school you've logged in with. I think it'd make more sense to give students links to bookmark. And, for the one time I've seen a teacher use Clever to give their students materials, they swiftly switched to Google Classroom, as it works much better for that kind of thing.
Can be buggy at times; for example, when favoriting a website. It may completely stop working until unfavoriting. No dark UI, though not important. Easy to configure and use. A little too many functions for a redirect program, but not negative.