Some cons: highlighting is actually pretty annoying when you're used to Perapera (though people who started studying with just paper dictionaries will roll their eyes at me for saying this). It also tries to translate English which is kind of annoying when you change windows often. It's also not a good study tool if your goal is language acquisition, but I find it serviceable for school-related 阅读. Still hoping to find a Perapera-type hover that can do it without the highlighting.