I just received my mini-action legs and here is my review. I am pretty impressed with them and will list the differences. Sorry, no pictures taken at this time.
Differences: Mini-action legs sit a slightly higher than the mini legs. I found the difference to not be an issue.
They do not allow a minifig with the Fantasy Era beard to sit properly. They do however allow a minifig to sit when wearing the old "Majisto" beard, or the new Gandalf style beard.It is a problem of the beards and not the legs themselves.
They are moveable (duh)
, but the reason I mention it is because of the flexibility. They are very stiff to move, which is actually a good thing. I think after some time, they will loosen slightly and become easier to use.
Overall, I recommend these mini-action legs. They are made by an AFOL, and they look fantastic and fit in perfectly with the style of minifigs. At $1.15 a piece, I think you would be foolish to not try them out. I'm glad I bought some and will be looking forward to more colors.