I "use" the Buffalo mk2 as targets for Reaper torpedo; that count?
In all honesty, at this point in the game, the Buffalo is mainly a nuisance/distraction. It seems to currently be a simple, easy-to-kill target to help build up a player in the early phases of the game. No shield, weak armor, low hull integrity. Weapon selection is reasonable, but the missile hardpoint makes for limited usage. If it had one or two front-mounted missile hardpoints, it would increase its utility a bit more (though probably not by much.) In particular, if the Med. Missile mpount was forward facing, it would open up the ship for use as a torpedo/rocket support vessel.
In packs of 2 or more with support, they can be a threat against low- and mid-tech frigate (anything with relative weak shields) with Pilum spamming. You have to juggle defense against the incoming missiles and fire from the supporting units. I got my Lasher's butt handed to me against 2 Buffalo mk2's, a Lasher, a Hound, and I think a fighter wing or two. I normally rush the Buffalo's, but the current AI is better at fleet cohesion compared to 0.51a. Though it was partly my fault since my ship config wasn't meant for mass fighting. I think I was set up for quick strikes. I would normally rush the Buffalos and kill them immediately, but they stuck togethr, covering on another, while the support units chased and surrounded me. I lasted for a while, but go overloaded and ate several missiles.
But yeah. Haven't found a use on my side for the Buffalo mk2's other than for selling.