Well my card arrived today, so I've been able to log in and have a look. There isn't a huge selection as yet, looks like they are still on the original 188, which is a mixture of mostly autobiographies, children's books and contemporary adult fiction.
The good news is that there are quite a few books that I'd like to read, the bad news is that almost all of them seem to be reserved so it was hard to find something to *actually* read. I only came across one book that was available to download straightaway, but of course I didn't fancy the look of that one

Some of them are reserved as far ahead as April.
The maximum number of books that you can take out on either loan or reserve is 3 in total, so you can't have lots on your reserve list (which of course works both ways, as otherwise there could be even longer waiting lists).
Hopefully if the service does prove popular in practice, they will increase the number of titles. In the meantime I guess I will just have to plan ahead & be a bit patient - but it's good to have a new and free source of contemporary e-books