I am currently working on a Carbineer/Fencer with hopes to master both (Which is possible, after calculating on the Char Builder). I wanted this combo because 1.) I've never seen a player with this prof combo before and 2.) I wanted a way to switch from a distance fight to a hand-to-hand fight easily (and maybe trick a few players in PVP who run and dodge when they see the Fencer weapon, and when they think they are gonna kite me, I switch to Carbineer and take down their action bar and foil their Eye-shot spamming LOL).
And with the very positive looking combat class updates on the horizon, these sub-par profs will take on a whole new (and fantastic) light. New weapons, name changes, HAM cost reduction, new moves, battle system reworks, I can't wait!