Agreed in general for stock controls, but stock controls are hardly the stuff of "beautiful interfaces," regardless of the platform. Making something look good consistently across platforms is difficult without using some kind of intermediary (I'll assert that your web browser, in this respect, is just such an intermediary).
Did you look at the screenshots or the actual app, though? Visually, it's clear these people have put a ton of work into making the interface gorgeous, well beyond the "pretty wallpaper" that so many of these apps are touting these days. And they do sync?!! And I can use it on my PC at work? And in offline "airplane mode" too? Sounds like a great choice IMO.