Mini Aussies are as old as the normal aussie... you can find references to breeding them in the late 50's and pictures of smaller size aussies back to the foundation of the breed as a motley breeding of sheep herding mutts around WW1. They are also not uncommon, at least here there are loads of breeders probably more than the larger size - you will find as much variation in them as the larger versions. It also means that there really isn't a lack of a gene pool to work from. Since the Aussie itself didn't join AKC until 1980 and didn't even have a set standard until 76' I think you can decide which "breed" is real and not real.
I've always been of the opinion there are loads of breeds with different sizes that are uncontroversial. I just see the smaller version hate in the mini aussie case being a case of sour grapes.
Oh then *shrug* I would just go about finding a responsible breeder as you normally would
my biggest concern was that since mini aussie breeders were "new", good breeders didn't sell breeding dogs to them, so they were using aussies from not so responsible places (so it would affect health)
Happy to hear that isn't the case
I don't have any experience with them, but since they are simply aussies bred on a smaller scale, I would think the temperaments were the same

and all aussies I know are bouncy, happy, driven guys and gals!
There seem to be a few videos on youtube on mini aussies, and youtube is always great for getting to know breeds even when you can't meet them face to face