The charged (aka sniper) version while being hitscan does less damage than a long bow and can only be fired 5 times before having to reload while the longbow can be upgraded to hold 10-12 plus LB can use skull crusher for max headshot damage which the havoc can only dream of. If you really cannot find any sniper rifle and you need long range, maybe use it with charged shot, otherwise use full auto version + sniper in secondary slot.
While it's mag size is meh in late game, it makes up for it with good DPS (not as good as R-99 or R-301 but good nonetheless) and easy to control recoil. You're better off using it with an AR mentality. The spool-up time, even on default without the turbo, is manageable unlike the devotion but I would still advise against using it in CQC as any R-99, R-301 or shotgun (well duh, PK is so broken it beats anything) will dump on you as you start spooling it up. Only really bad thing about it is the ammo type though. If you're unlucky, you will run out of energy ammo quite rapidly.
In short, I see it like a R-301 that sacrifices a bit of DPS to gain a bit of accuracy.