For the price this is an awesome little attachment for my bolt-on drill. It works well for small to medium sized projects. I would not want to use it for big or prolonged projects as holding the drill trigger can be tiresome after a while. I would invest in a sander that has an on off switch for those cases. But overall I'm happy with this and it has gotten the job done for my small home projects.
It doesn't have enough magnitude of vibration to do very much sanding. Only the smallest jobs on soft materials can be successfully sanded.
Good quality and size, looks nice, haven't had a chance to use it though. I am thinking about collecting the whole series and put them all in my tool box.
I only use a sander occasionally, so this Bolt-On attachment fully meets my needs.