The 007-inspired Vesper has made the headlines with it's Heat-like ensemble, the app functions rather cleanly (as expected from Simmons), looks great (as expected from Wiskus), and has a clear purpose along with a great font (as expected from Gruber). - GridWriter
Here’s a thought experiment: Imagine a new note-taking app written by an unknown developer. It’s has a nice, clean look and is easy to use, but it has no syncing, no TextExpander support, and no URL scheme. Assuming the app got any attention at all, how much effort would Apple bloggers put into defending that design choice? How often would the phrase “data silo” be used? - Lean Crow
From the outside, then, it’s easy to be dismissive or even resentful: How can these guys launch a relatively expensive text-note app that’s missing so many features of competing text-note app. Balls. - Marco Arment
Instead, we’d do ourselves better by remembering that the the real work is being great – whatever that means in your field – over long periods of time. That is what earns you the trust of an audience, and that is why these three have succeeded. - Tre Vormckendrick

A selection of reviews of Vesper telling a side story that's interesting. Do we base our purchases in the quality of an app. Its features. Peer review or the merits of its creators? Based on the review online, I'd say the latter two.

I like the design. But I'm currently not buying it. Gruber doesn't need my support so a friendly buy like with new startups is not needed. I bought almost every ADN client there to try them. And even without using them. I supported a valid and new ecosystem. But with this app I know I won't use. And even through I'm intrigued, I'm not directly supporting improvements to an ecosystem. The market of text editors is saturated. And I'd rather support a new comer with good ideas, than an established value who doesn't need the support anymore.