27 patches, but only some of them are really important. So I could say;
"Patching really enhances the Kobo experience" instead of
"I could never use my Kobo without patching".
When I bought it I didn't know anything about patches, I bought it only for the larger screen, so it is not true that I could never use it without patches, but surely now it would be difficult to come back to a not patched Kobo.
And, at the end: I like to make experiments on my Kobo
* really important