I've been playing it for quite some time already, really interesting game. Has some annoying problems though, since it's base on peer to peer connection, lag becomes an issue if someone has shitty connection. And it's not really beginner friendly, especially in TD(TD = Touchdown, one of the modes in game, a bit like ctf)
But it's worth a try, if you decide to play it, just remember not to buy clothes before you get a permanent set of 3 weapons and one skill. Also, go to s4source.com, and read the guides there, they'll really save you a lot of frustration.
I play a lot less then I used to recently, mostly station-2, since it's the only stage when I can constantly bat people off the stage

And yeah, stormbat would be my favorite weapon.
Since I'm really horrible with money management, I have a bunch of different accounts with different setups, though mostly playing on erious-dono or shirokuro_neko recently.