Well, the SAW can be fun for sure, but other than a more copious supply of ammo, it doesn't offer any more advantage over another AEG.
I should add that I've never actually fielded it myself. Friends used it at the games we played. It was a force to be reckoned with at Border Wars II. I found myself on the receiving end of it a couple of times (my friend was playing on the other team).
With the hopup mod, my friend said that it was outranging most other AEGs. He was set up on a path behind a barrier. He said he could see BBs from the other team hitting the ground 10+ feet in front of him, but he could tag them from where he was sitting. I'm going to have to put that to the test myself someday...