Ranked in these QuestionsQuestion Ranking
Pro Layer Sharing
Features such as 'Layer Sharing' allows you to quickly update shared components such as headers across multiple pages. Other mockup tools such as Mockingbird will require you to manually propagate changes across all the pages.
Pro Can be used for the entire life-cycle of the design
From lo-fidelity wireframe, into clickable prototype and then assemble the images for the final hi-fi build as well.
Pro Combined Pixel AND Vector editor
Best integration in a graphics editor.
Pro JPG compression preview
Offers a side by side comparison of different JPG compressions in real time with magnifier.
Con Was phased out by Adobe
Adobe abandoned this product with no single suitable replacement. Unfortunately, a common story with Adobe products. -- Very disappointing.
Con Crashes every once in a while
It is prone to unexpected crashes. Frequent saves are recommended. -- AGREED!
Con Proprietary PNG format
If you created files with their proprietary PNG format and you no longer have Fireworks (they phased it out) then you're out of luck since nothing else will read those files and preserve the layers and other features that Fireworks offered.