I studied with the OU too, though only a Diploma of Higher Education (equivalent of 2/3rds of a Bachelor's; I think Americans would call it an 'Associate's Degree'?).

I found the material of good quality, and the tutorials/lectures I attended were fantastic. I did, admittedly, feel that the level of support could've been greater, but for a predominantly distance learning education that's par for the course, IMO.

The debt is indeed a bummer! Still, their fees are lower than most other UK universities right now, and my study landed me my current DevOps position, so I'm very happy.