I change attachments based on the tactic. In close range environments, like, a biolab, I ditch HV ammo and use a Compensator/Frontgrip/x2 Reflex sight. The lack of recoil means more then my ability to shoot things at a long range.
One thing that confuses me is people who use the laser thing. "HEY LOOK! I'M OVER HERE HIDING BEHIND THIS DOOR!"
I haven't spent any money on the game yet for various reasons so I can't actually afford the HV yet. Might have helped if I hadn't bought every sight for the LMG and about 100 certs into the engineer which I don't even use. Plus the whole three-characters thing. Would be nice if certs earned were tied to your account rather than character.
Never understood the laser-fetish people have either. Does it even do anything useful? (for the person with it on their gun, I mean)
Well good, because money can't buy certs. It can buy you XP boosts up to +50%, but you can't buy certs, and thus, anything for a gun, with money. What you can buy is Station cash, which you use to buy guns, camo, etc. I had Alpha Squad, so I got my Hawk, Crow, and AA rockets for my Reaver that way
It's like a reflex scope for the hip, you get that dot in the middle. Makes it easier to aim from the hip, in theory, but it's nowhere near as good as just aiming down your sights and it lets everyone know where you are, even if you haven't shot yet.
Cons out weigh the pros from my point of view.