I have satdrive installed at home and have had it for just over a year now.
At first it was excellent.. ten times the speed of broadband on downloads all day and night.But then they capped the service due to over subscription,still relatively speedy,and for those of us unable to have broadband via the phone lines,the only viable option at the moment.
Check out this website for a unbiased opinion from current users of satdrive :
http://www.satdriveusers.co.uk