Quality ereaders for the Mac are slim to none. iBooks is sufficient, but barely. Nook and Kindle (for the Mac) are better then nothing but lacking much in polish and options. (Nook for the iPad is good).
Then there is Clearview, which looks like the developers actually care about a quality ereader.
Best features:
1) In addition to page to page scrolling, Clearview offers the option of scrolling as you would a very long webpage. Its more fluid/natural by helping one keep his/her place on the page.
2) Underlining in addition to highlighting. Highlighting is ok in many situations, but I find underlining the best way to go because it is subtle yet clearly distinguishes the chosen text.
3) Clearview handles pdf files nicely, but the real plus is that one can apply a black background. For a pdf that is great!
Whats needed: Clearview offers three themes: 1) black on white and 2) white on black (both functional but nothing exceptional). 3) A sepia theme that is ok. But what Clearview needs to remain on top is the ability for the user to color the text (as BookReader does). User chosen color backgrounds would also be excellent.
Is Clearview the best ereader for the Mac? Yes, although the competition is weak. None the less, Clearview is the ereader to acquire and the price is more than reasonable.