If you're a fan of the main series, it's impossible not to enjoy these OVAs. While the focus is shifted away from our main couple, these episodes are undeniably sweet, and delve deeper into some of the side relationships that didn't get as much focus in the main series.
My only complaint was that the second episode ended on a pretty unsatisfying note, though I can only hope that might be rectified in the future with another season.
Overall though, the OVAs are very similar in tone to previous episodes, so there's no reason not to give them a watch.