Hi,
I had a look at the amazon link - didn't really show what's inside the book?? Although the description looked pretty in depth - eg extended position is fairly advanced for beginners.
Most of the cello methods I'm familiar with are aimed at younger beginners and you might find them a bit babyish, but if you are still looking for something to play, you might like to try the Cello Time Series...
Published in 3 volumes - Cello Time joggers/ runners/ sprinters.
These books have tunes of varied styles - classical, jazz, folk, contemporary, etc. (really good CD backing).
The only downside is that the books don't actually explain
how to do things very well - it just presents the info and you have to work it out (if you already play another instrument you should be fine). I love that synchopated rhythms are introduced nice and early so you are not limited to classical tunes.
If you want to get your teeth into technique try the Superstudies series - these are studies that are craftily disguised as fun songs (actually pretty challenging)
Best wishes. Let me know how the other book goes if you get it-I hadn't heard of it before and would like to know if it is useful.
Cheers