GitHub User: blatyo
The only problem I have with kaminari is that you cannot change the parameter used from :page. This means it isn't possible to have multiple paginations on a page. Though, this probably isn't a common problem.
I do like it much better than will_paginate though, because it allows its based on scopes, which means you don't get weird errors when trying to apply other scopes on a paginated object like you do will_paginate.