I haven't gotten past a basic family tree of four generations. I would like to though. My husband's cousin's mum has done extensive research on her family. She has found that their family originally came from Russia something like a couple of hundred years ago. I think it would be absolutely fascinating to do, but I imagine it could take a long time to research.
I've never researched my genealogy, but my grandma did a long time ago, and has documents on it. Although I find it interesting to some degree, another part of me just can't be bothered to do all the searching or go to the expense. I find it more interesting to just hear stories about relatives from living family members. Any other back than that, and it is really just a bunch of names.
I have tried to do mine. It is VERY time consuming though, and I have come across more than one brick wall to my progress, especially on my fathers side. I have traced back to the 1700s on both sides. My aunt is writing a book about my husbands side if the family.