Apart from my main tree, the Martial Arts (all three branches), I also have all Arbalest abilities upgraded to my current level, 38. Well, ok, they're at 37 right now, but that doesn't matter.
I've bought that tree quite a long time before CR 2.0 was released because it was quite powerful back then, but now that it was toned down, I don't see much attractive in it anymore and consider to get rid of it, maybe to replace it by Gunman. Now that vendors consider the levelling cost when buying abilities, it's become feasible.
So my question to more experienced players, would ít be wise to do that? Can I get an acceptable viral defense (and resistance) by applying the right stat points and stand against hackers in missions without hacker abilities? (I'm planning to get all trees at level 50 anyway, so this would be just a temporary decision for mission PvE, not PvP.)
Or is Arbalest still useful and I should keep it?
And an additional question, is the price I get from a vendor by selling him an upgraded ability the same I've paid to upgrade it, or is it still less? Because if so, I'll, of course, scrap my plans immediately 



