I received my clippers yesterday and tested them out the same night.
It was my first home cut and it went extremely well, the clippers couldn't be simpler to use. The results were just as good if not better than a trip to the barbers. Just a grade 3 all over, however, the accompanying dvd gives tips on different haircuts and the techniques to be used. The dvd also covers clipper maintenance and what not.
Ear combs would be handy (not included in this kit) but regardless it was still an easy process.
I based my decision to buy on personal recommendation and reviews on this site (and others) concerning the 600 series model. Most people who had bought the 600 previously owned the 300 and were more than happy with it. The only concerning factor for me was price.