Unbranded cheapo viewfinder for DP2x

Hello everyone,
I have ordered a Signma DP2x for Amazon Japan. Just waiting for it. My first digital camera after some years of film - just messing around on holiday!
Anyway, I would definitely want a viewfinder but can't afford the VF-21. Has anyone used these little things? I think if I get the 40mm one it might do at a pinch?

www.ebay.co.uk/itm/403508591814?chn=ps&var=673490569988&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&mkscid=101&itemid=673490569988_403508591814&targetid=1405062617979&device=c&mktype=pla&googleloc=9045886&poi=&campaignid=17218284410&mkgroupid=142217514411&rlsatarget=pla-1405062617979&abcId=9300867&merchantid=563013693&gclid=Cj0KCQjw8qmhBhClARIsANAtbocMXQNwDTU2Sf46wRMrHZeX4F_KdM-m0GrYO0gyCIGXqz2YyK6TM00aAowYEALw_wcB