Hi Mike,
For me it was worth the cost, even the original cost which came to almost $300 (Thankfully, my order was placed just before they lowered the cost to £99 and the PRO was kind enough to refund the difference). My initial reasoning for buying the CD was to cross check their digitized transcripts against the TIP copies.
The CD says "...over 7500 pages..." Keep in mind that there are two copies of each of the inquiries as well as their respective reports (a .TIF format photocopy and a digitized/searchable copy). This accounts for well over 4,000 pages.
From what I've seen in my forays into other areas of the CD there is a large amount of correspondence, mainly amongst British Government officials.
My opinion would be that for a person who is a Titanic fanatic and wants to spend a lot of time reading over a large amount of mostly unimportant messages and acknowledgements, and the many Thanking you for your memo of such and such a date, the CD is for you. For the average person though, between various websites on the subject the important material is already freely available.
I must apologize Mike. While this post was rather verbose, I am not entirely sure it helped with much with your question.
If you are planning on attending the Topeka get together I will be sure to bring my copy with me and those there can peruse it.
Regards,
Rob