I have been trying acrylic paint for plein air work lately. (I briefly used acrylics when I started painting 4-5 years ago, but quickly moved to oils.) The advantage for plein air work is the quick drying time means you can go over an area without worry about disturbing the pervious layer and getting inadvertent mixes. I think my recent work with gouache has prepped me for acrylics, as they are similar (gouache= matte finish, acrylics=glossy finish)
(These are both 9x12 on MDF board)