As a pilot, it was okay but not amazing. Back then, I didn't know who Yuusaku, Hikaru, and Kazuya were. I only know that Madoka is this beautiful waifu. I watched this first so I could experience it without watching the TV series. It gave me a good enough motivation to watch the TV series, but nothing to write about. Had I watched the TV series first before watching this, I might have had a different opinion as I would have had some context as to who these people are and their relationship dynamics. It is essentially an earlier of version of Episode 46, an episodewhere Kyousuke and Madoka are in a life-threatening situation.

As I am writing this, I checked some of the clips and the animation is stunning. As mentioned earlier, it's not complete unto itself but can be a motivation to watch the main series.

I won't recommend that route right now. Just watch episode 1 and see for yourself if you like this anime. The only reason the studio created this is to test the market if there are viewers who would be interested, sort of like a beta version.