I cancelled my online membership after the first 3 months as wanted to save money and do it alone (and minimins!) but lasted 6 days before I mailed them asking nicely to reinstate my membership!
When you don't pay to be online you lose most of the functionality of the iPhone app and I bought some different 'unofficial' ones but it just wasn't the same. So ended up thinking it's worth £10.95 a month for tracking/pointing/weigh in etc all under one roof.
Hope this helps!
Sent from my iPhone using MiniMins