I've subscribed to the pipe cutter technique for a long time now. Pretty difficult to mess that one up so long as you subscribe to the "measure twice, cut once" theory.
However, the one frustrating thing about pipe cutters is they tend to mushroom the steerer tube at the cut, fattening the outer diameter (making it difficult sometimes to slide through a stem), and creating a tiny lip that may slightly impair the insertion of the star nut.
But this is minor, and nothing a quick pass with some sand paper, a file, or a Dremel can't solve.
Recently I found an inexpensive head tube cutting guide at Performance under their Spin Doctor tool brand. I decided to try this along with a hacksaw, next opportunity I have to shorten a steerer. But I still wouldn't hesitate to recommend the pipe cutter method as no-nonsense and relatively foolproof.