I have literally just finished and thought I would post my thoughts before snoozing of wizards and giant turtles 
There is so much to love about this book. It's hard to talk about without alluding to the books to come but it gives a tantalising glimpse into the richness of the Discworld universe.
I adore the way that there are wild & wacky bits but my favourite is when things that I know inside out are given the STP twist; so the luggage, the camera, in-sewer-ants 
My absolute favourite bit though is the part where Rincewind slips into our universe for just a few minutes and heroically saves a plane! It's not until you finish reading that part that it all makes sense and I re-read it with a huge smile on my face at the sheer brilliance. Dr Rjinswand from Sweden with Herr Zweiblumen 
I have The Light Fantastic to hand but may have a slight hiatus before I dive on in!