Incredibly late (as always) but I finally finished watching this anime. So sorry for the necro-bump but yeah, this was awesome stuff.
I read the manga first (well, up till the latest translated chapter), so I was a bit hesitant about trying the anime (comparing it to Black Lagoon, the manga was epic, but the anime was, aside from the twins' arc, a major letdown, not that Roberta's OVAs managed to do any better =_=), but I'm pleased to say that I was worrying for nothing. Also, I feel that Jormungand!anime was better than its manga counterpart (still dark and edgy, but managed to convey stuff that the manga couldn't, which is a big plus for me).
And yes, Valmet is awesome <3. Eat your heart out, Revy. :P
Speaking of the upcoming second season (spoilers ahead for those that haven't read the manga)
I can't wait to see Hex in the anime. In the manga she was my favourite villain, even though she and her team killed R (poor guy will never have another chance to go casanova with Valmet =/). Also, I'm hoping that the anime will have a more epic, action-packed ending (I saw the raws of the last volumes and, after R's arc well... nothing fancy happens, no gunfights, no more arms dealing, what the heck).