I have used it quite often and really like the Whip now. My biggest concern is the size and proximity of the thing. You have to be so close, that you can't see anything when firing at it.
Damage seems to be fine, and it moved pretty slow so you can keep up. I have to use cards that cause the downtime on portal timer to be lower otherwise the tactical effectiveness of it goes down the tube. It's strange that the ability cool down on this weapon is the longest of all her guns.
You would think the harder to use, the shorter the cool down, but with Valeria's guns that's completely the opposite.