I've never been a WM user, so don't assume I'm a WM lemming...
Generally, I've been quite happy with Pocket Informant, and the developer has done a pretty decent job of making it more functional and faster. It was a couple versions ago that deleting a single recurring appointment would take up to twenty seconds to process, a frustrating process when I've got ten more to delete. That's history though, it doesn't take nearly as long.
I've also noticed that of the four or five Gcal apps that I've tried, Pocket Informant is the most reliable when it comes to sync, and that when it doesn't sync due to an unlocked captcha, PI is the only app to redirect me to Safari and the Google unlock captcha page. All the other apps simply give me an error code.
Seriously, PI is one of a few apps that I wonder how I did without. I expect that it'll get more stable, faster, and more functional, all based on their past performance on just this platform alone.
Certainly there have been some bugs, and PI might not be suited to a power user just yet, but for most people, I think it does a very fair job.