I got my Suros from a legendary engram a while back from a Nightfall Strike. I use it on my Titan character because it was the only Primary Weapon I had available to trade over to my Titan. I don't like the Suros at all. It looks cool but I'm much more happier with my Atheon's Epilogue. Also, I don't find the Suros superior at all. I've been killed in the Crucible by other weapons that I haven't even heard of more times than the Suros. I would love to use a hand cannon or a scout rifle but I haven't been lucky enough to get one of those to drop for me yet.