It's expensive, but is an amazing weapon, and needs no ammo.
If you have Gun Runner's Arsenal, try to buy the MF Hyperbreeder Alpha in Novac.
You'll frequently find Fiends with Laser RCWs, Laser Rifles, and Plasma Rifles. Also, the best sources for energy weapons are the dead Bright Followers corpses you find now and then, and Fiends. Try to get Vigilant Recycler as soon as possible. That allows you to deal with the relative fragility of your weapons and scarcity of your ammo. I find that the most effective starting tags is Energy Weapons, Repair, Science.
Luck is your most important Special for EWeps.
