2) I've only read The Romulan Way, and I quite liked it (maybe I'll reread it after I finish my long-overdue reread of The Final Reflection). I've considered getting ebook versions of the entire series, but, like you, I find the pricing somewhat absurd (and doubly so for the ebook version of the omnibus, which is about $32, or more than the combined price of the four novels it contains, and, because of timing, doesn't include the fifth novel in the series). I do certainly think much better of it than most of the Romulan development that's happened in canon.

"Mathematics brought rigor to economics. Unfortunately, it also brought mortis."
- Kenneth Boulding