I was skeptical about the vertical until I bought one a few weeks ago.
The knock-off Joy Pen is great, and I quickly came to love it. I am not a gamer, so poor specs don't matter to me.
But I really want a left-hand mouse, and the only style that is apparently available does not appeal to me, besides being very expensive.
I have large hands and dry skin, so it has to have the combination of a bigger size and a texture that is not slippery. I also like the slight angle or lean of the Joy, the others seem far too upright.
Google search and ebay/amazon do not return viable options for me.
Thanks!