Hey, my last vacation was my first chance to try the Diana F+ what I got for my birthday. :) We bought a 35 mm back for it as well immediately.
So, a guy in the Lomostore in Barcelona- who was supernice and superfriendly- convinced me to try the Lomography X-Pro Slide 200 to get very acidy pictures.
I know it is my first time with the Diana and I also know that my lab is only able to develope negative (and slides are not those, right? :-/, but the packages said you can develope it with C41) but I am a little disappointed. The colours are not as bright as I expected. I guess my setting were not the best.
I keep trying though.