Protx VSP form vs VSP Direct

[nineseven]

I have just set up a protx vsp form account for my website and am considering upgrading to VSP direct as I am moving my site to a new dedicated server in the next few weeks.

Do you think that customers would be more inclined to buy from my site if there payments were processed on the site rather than being transferred to the Protx payment pages?

Also I would be very grateful if anyone could give me some honest feedback on my site

http://www.designer-sunglasses-store.co.uk/

Thanks