I agree (mostly) with John Smith.
I finished an OU MBA in 2000 and found the materials excellent - books, tapes, videos etc (these were all included in the fees).
The tutors - mostly self-employed consultants with pretty good CVs - were fine, some better than others as you'd expect. In the 1st year, they were the most patronising people I'd ever met.
In terms of networking, it was pretty odd. On the one hand there were people from consultancies and other orgs as I expected - mostly paying their own way, so taking a relatively cheap option. However, there were many people I didn't expect to see - GPs, lots of Armed Forces people, politicians and faith healers, psychologists, air line pilots, marketers, etc.
This immeasurably added to the experience itself but was of less use in forming alliances and useful networks. On the plus side, I have met a lot of public sector people since who have been through it and when they are buying, they rate it highly.
Would I make the same decision again? If I had the time and money, I think the big name, full time, 1-year course would be my choice. A former colleague was at Cranford and the network and camaraderie etc sounds excellent.
Final note: my salary has increased by 260% since getting the MBA.