Too good to be true card reader?

Has anyone got experience of one of these type of readers?
It sounds like it will handle large capacity cards (some of my readers won't) but interestingly it seems that it would work with laptop and PC but also with a lot of mobile phones and even tablets?
Reviewing actual files on the phone and editing raw with Lr app and emailing or backing up without leaving location, without needing wi-fi sounds great, but is it going to be that easy?
It sounds like it will handle large capacity cards (some of my readers won't) but interestingly it seems that it would work with laptop and PC but also with a lot of mobile phones and even tablets?
Reviewing actual files on the phone and editing raw with Lr app and emailing or backing up without leaving location, without needing wi-fi sounds great, but is it going to be that easy?