I did T189 last Autumn as a relative novice to DSLR (had my A200 ~4 months when I started).
Overall I thought the course was quite good - and if you use Tesco Cubcard Points to pay for it then it's very cheep
However, there were a few issues
1) Supplied PSE 6, but tutorials (via film clips on supplied DVD) were for PSE 5, not a real issue if familiar with PC's and happy to 'play' a bit, but annoying.
2) It's run over 10 weeks, with weekly photo 'assignments'. You study the weeks coursework then do the photo assignment then post images up on the OU photo sharing site for C&C from other students.
This is fine in principle, but if (like me) you work full time & have young children, then time to take photos can be limited - add in British autumn weather and you might only have a 1 hour slot at the weekend, for example.
But this means you might post your images very 'late' in the week, and so get little feedback.
3) There is a short multiple-choice exam part way through (fairly easy), plus a final submission of your 10 best photos + answers to 3 questions (from 6?).
But photos are limited to 1024 on the long edge and have a max disk size for the set of 10 (can't remeber what).
You then wait, and wait... it was 3 months before the results, which was just an overall pass, plus a rating (1-5) on the photos as a group.
Then you wait some more, post a few queries on the OU forums and discover you will get detailed feedback in a few weeks time...
Which in my case was, in my opinion, very poor - and had at least 1 inaccuracy (it refered to something in a photo and gave the wrong photo ID).
The course as a whole I enjoyed, and certainly learnt from it, but it was definately let down by the above problems for me and I felt I could have learnt more if things had been done a little better.