Yep. PJAX and it's ilk are wonderfully simple, degrade well and fit in with many existing approaches.

We added PJAX rendering to a Django site in under an hour. All the benefits of SPA's and few of the downsides.

I've started using PJAX where the rendered page does not have to change when its source data does, and where you don't have large tables/calendars that would have to be re-rendered when one data value changes.

Development is significantly faster, less error-prone, easier to maintain. Development can also be given to people with lower skill levels.