From what I can see this is the first Mega.co.nz client for Android (or any platform actually).

Google Play link: https://play.google.com/store/apps/details?id=dk.alxb.megamanager

Currently it only supports download but more is coming soon.

I would really like some feedback from people as to whether this app is useful or not.

It's currently only for Android 3+. Support for Android 2.3+ is planned.

Let me know what you think.