Hi Bill,
I did this last year, as my first and to-date only marathon. It's a fantastic race - I loved it, and doing it again this year.
Crowd support was superb last year - plenty of jelly babies, cakes, juice and water on offer, particularly the housing estate you pass through just after midway (the big downhill on the way to Gideons green), the "only" tough bit (apart from you know, running a marathon!) is the boring, quiet section through an industrial estate around mile 19-21. Apart from that miles 7-13 are a mostly gradual uphill, tho the uphill isn't all that severe its just kinda constant.
I read a lot of reviews of this race last year before doing it and there was some negativity around the organisation of the event, but I didn't see any of that on the day and thought it was fantastic (though I don't have anything to compare it too!!).
I'm sure you'll have a great time doing it.
Cheers,