After months of saying I wouldn't be renewing, I've now gone and renewed earlier than ever before! The cheap ST deals swung it for me. I had planned to pay game by game, but guaranteeing your seat at £15.50 per game was too tempting.
Not sure how many people are aware of these offers though. I went down to the ticket office late afternoon yesterday and there were no other customers in there, and just one member of staff! There appears to be plenty of cheap ST left too.