BB both me and Steve did Abingdon last year after Outlaw and it was for me at least slightly taxing (not for steve mind he's a machine, as well as being a very nice bloke). Was well worth doing through even without it being a good marathon just for the kick up the bum it gave.
If you've got the cash I'd enter it even if your not sure you want to do it. it will fill up and then the worst thing is you've swapped a place with someone. Your going to find after you've done the Ironman your motivation might dip for a time and the target off a new race could be very useful.
