i got the vuescan tryout version for my v700 but i was disappointed on the level of difficulty and lack of an intuitive interface. I could not bother to start learning the whole thing.
Also, the most important thing why i was considering it, was the colour space control and the batch scanning option in one package. Colour space thing is well done in the silverfast se, batch is implemented in the epson scan software, but none of the se two have both requirements properly made. And then i found out, the tryout vuescan lacks both of these features.