At £2 a pop, I wasn't sure what to expect but these faceplates are pretty good. The keystone jacks are included, so you don't need to buy them seperately. Also included are labels so you can keep track of which sockets are which. The only thing you may want that isn't included are some zip ties to secure your cable to the back of the faceplate but it's not a big issue.
These faceplates can be used with standard 25mm deep backboxes, no need for anything deeper.
In terms of functionality, they're fine, no connectivity issues at all.