I went to see this in theatres today, and overall it was a pretty fun day out!
Someone in the group was completely new to the series, and luckily she could follow along just fine between the movie and looking over a brief overview.
On the other hand, I'm completely caught up on the anime and currently reading the manga, so I had some basic expectations that were reasonably met. I was pleasantly surprised with more Bond than I bargained for, since the trip during Season 2 left him back home. And overall, there's arguably more action in this movie than the entirety of the series so far, which isn't particularly something I was looking for but also not a criticism against it... just something different in regards to a movie format as opposed to the meandering, funny day-to-day the main series is known for.
Lil Anya and Bond still cute. Lloid and Yor still amazing. The plot starts rolling by eating a piece of chocolate the government is after, so you know it's your Spy x Family shenanigans. Solid addition to the series.