I have just completed my 1st year, 1st semester Criminology module at my (UK) University. This, being the core textbook, was required for my course (which in itself is a nice change as most modules do not have 1 set text anymore).
I cannot praise this book more highly. It not only has separate Introduction, Findings and Conclusion sections with useful boxes round it to make it clear, it also has at least a few pictures which is a welcome change from text heavy readings. Also, the book is relatively easy to follow considering it follows the Social Science model of 'a sentence is not really a sentence unless it's 10 lines long'. It also explains concepts clearly, concisely and simply.
Add to this it's associated website which has full chapter summaries and lots of other resources and I'd suggest this is one of the best core textbooks on the market and not even that expensive. (Although I have had to spend £30 on a single textbook so I'm not the best judge of that).
I do not do a full Criminology degree and this is my favourite book off the course excluding Craig Webber's
Psychology and Crime (Key Approaches to Criminology)A good all round text.