I have 173 collections on my Sony, but only authors. At a guess I would add 12 genres,
80-100 series and maybe 1000 tags if I did try to utilize them all.
When I got my T1 I thought it would use the same calibre driver as the 600 - 350.
Imagine my dismay when I put on 300 books and had 2700+ collections.

And yes, I have a lot of books on my reader, but I NEED those books and more(big pouty
baby picture)
My mother doesn't need all of those books and excessive collections are confusing to her.
But she Has been known to call me in the middle of the night from the opposite coast where she lives and ask me to please get her another book as she is bored with the current ones on her reader. My mother is 87 so I don't make her do it herself although I have tried in the past

Then she reads the ones I send her via Amazon (kindle is registered to my account/credit card) and happily goes back to the ones that were on there before and doesn't want to budge for a month or so.
Her biggest problem is finding books on the kindle, collections or not.
I really wish I could come up with a solution although the kindle is one of her most prized possessions along with its leather case. She resisted the idea when I bought them for her but now tells me she feels rich whenever she uses it

which is every day.
Well meandering well off topic, but if you can find time and have any additional suggestions as to kindle usage, I would welcome them
Helen