I got the Acolyte yesterday, which I've been using with my Vanguard. I loaded him up with a new shotty (loads 8 shots, semi-auto), and upgraded so I can charge and Nova very quickly. I've been able to move about with a flickering akin to a much more quickly Banshee.

Acolyte burst, charge, shotgun, nova, charge, shotgun, nova. My charge will be ready almost instantly when I use a Nova, and I can Nova immediately after a charge.