Looking to upgrade my main portable single light system from a 580 EX II with Radiopoppers to something more substantial.
Initially, I was looking at the quadra or the Qflash, but it doesn't look like I can get into that system for less than $1400. That got me thinking that I might be able to simply add the new vagabond lithium battery to my current AB's, and get a similar setup in power, with a small sacrifice in portability.
Other than size/weight, what tradeoffs might I be missing?

