No I am not a fan of 3. (I hate them with a passion). But it would seem that if you want a IPad on a contract then 3 is offering a better deal then elsewhere. Compared to T-Mobile and Orange offering you 2GB (at select times) then 3s deal is really good .15GB of data use any time. If this makes up for the poor coverage and lousy support from 3 only you can decide.
http://www.three.co.uk/Mobile_Broadband/iPad
http://www.three.co.uk/Mobile_Broadband/iPad