I dunno about the suppression and support role, exclusively. Mine's an assault rifle on steroids. It's also not the heaviest gun I have (my SAM-R, when fully accessorized, holds that title).
I think LMGs are a bit like sniper rifles: you need to really want to get into that role, it's not just something you start using randomly. I really wanted to play with one and a while back Brakoo lent me his for a game; after that test drive, I knew it was something I had to buy.
But if you're just looking for another AEG, it probably isn't the right gun for you.