Probably the biggest issue with strand based Poser hair is that aside from the guide hairs it isn't actual geometry, but a runtime effect generated at rendertime. Vue's renderer and Poser's is enough different that -at the moment- you can't get identical results. You can improve the results by tweaking the Vue material settings for the hair pieces until it looks the best. The darker hair colors tend to look better; so far no one has worked out a Vue specific shader for the strand based hair, and the brighter the hair color the more visible the stranding becomes. Maybe in time this will be corrected by one of the parties....