Positive strength Impression filters produce 'bauble' bokeh in the background, where out-of-focus highlights are bright in the middle and blurry at the edges, especially towards the center of the image. 
Foregrounds may seem sharper. Around the outer parts of the frame, positive filters add a swirling bokeh effect that envelops central subjects and provides a wonderful look for capturing intimate moments.   
Skin tones seem to glow, and the whole image has a feeling of nostalgic glamor. They quickly install via convenient magnets on the rear of the lens.

ARRI Impression V Filters are a great cost-effective way to achieve multiple looks.