RE: Andygates vs. the Devonshire Troll
It is fun. The bag's a bit more floppy and a damn sight more bloodyminded than a punchbag. For my money the best bit is that you can throw it on the ground when you're done without stoving in a paving slab, though - that's something you definitely can't do with a barbell. Definitely an adjunct to regular training, but one of those things that makes me smile.
Oh, and ache. Good, holistic shoulder-girdle agony!