Hpcock,
No I was just interested, I'm about too sit mod2 exams in september,
I did the 1st Module in 8 weeks with Bristol and passed all 8 exams and have been doing mod2 for about the same amount of time. It's been hard work doing the course in 2 modules, and in such a short space of time, but I don't think it would be any easier if I had done it in 3 sittings.
I just found Aimhighs comments rather obnoxious to say that it makes sense to do it in three sittings, and then to find out he works for CATS kind of explains why.
Having not done a 3 stage course I can't comment, but I can say that doing it over 2 stages is probably alot harder, for the simple reason you have to learn more in one go. If you are competent in your ability and can work well and structured on your own via DL then I see no reason why you shouldn't/can't do it in 2 sittings. However I can see the benefits for some in doing it in 3 sittings.
The only thing I would suggest before going with a school is getting there pass marks for past students, if they are as good as they claim then I'm sure they would be more than happy to promote this. I'm just happy to be another pass statistic on the BGS books, and if I pass the mod2 exams as well as I did the mod1 I'll be very very happy..