I have yet to try any of them out apart from the Fuji instax mini 7. This little delight was found by my Dad (he's awesome and shares my love for collecting cameras!) for £2 and it hadn't even been opened, there were still batteries and more excitingly, a film! Unfortunately, it went out of date in 2003 so only a couple of the pics have come out, but it's still fun and gives a slightly different effect to my newer instax :)
The Polaroid 10 is very bizzare, you have to pull a ring to get the picture out but if I find any film, I'll have a go!
I really need to get some film and try some of these out..I'll let you know how it goes :)
I'm hopefully going to another car boot Sunday, although I'm not sure I have room for any more cameras!