hubiC had a great campaign a while ago which made me try it out. their client crashed and produced dialog boxes every time my notebook was offline or didn't get an IP address fast enough.

My experience is about half a year old now but back then it has been a horrible piece of engineering not only from the client but also from their website (EULA in french only).

Personally, I felt it was not good value for money but rather a cheap service that I wouldn't want to trust with my data let alone backups.