Flex filament anyone tried?

Hey guys, I was just wondering if anyone has tried some flexible filament with their solidoodle.  Gf was asking me what I wanted for Christmas so was thinking of more "ink". Lol

If you have,

What temps did you set everything to?
Was it a easy change from regular ink to flexible?
Is it actually flexible like rubber?
Does it smell?
What flex ink brand do you recommend?

I'm planning on making shoes to test them out, as well as other clothing components.

Thanks!