I've read posts about installing PageEdit, and external versus internal, or making it a Plug-In, etc. The important questions to me are: how well does it work in comparison to Book View and what extra features does it have?
As far as Book View bugginess* goes, I've written eight novels in Sigil. I spend most of the time writing in Book View, because I do not wish to interrupt the flow of writing by typing <p> and <i> every ten seconds. I have used Sigil since version 0.7, and I never had significant problems with Book View. I've had problems with Sigil in general, but they mostly were about saving and Check EPUB. Without Book View or something equivalent, there is little to recommend Sigil. BBEdit has much better tools for writing HTML, and assembling HTML chapters into an ePub is easy.
*Macintosh versions. Your mileage may vary.