Tony Knight
Tony Knight reviewedSketch 40Latest version of the vector drawing tool
 RecommendedPros: 

Made me rethink everything & allowed me to kill my CC subscription. SVG support is killer, & I've now moved all my vector files to svg

Cons: 

Nothing worth quibbling over.

It's the best prototyping tool I have used for web and app development.

Tony Knight has used this product for one year.