Lighting is great, categories checkbox style is not... Rated 5 out of 5 stars
I too don't like new checkbox solution for categories. Old method was better and faster, and this seems like a downgrade. But I'm still gonna give this 5 stars, because I'm using it for years and I can't imagine Thunderbird without Lighting anymore. :D
I really don't understand people giving this one star and such, only because of occasional problems. That's why the best add-on for thunderbird has such a low rating.