Kamen Rider Build is a great, fun series. The main characters have great chemistry, most notably the main two protagonists of Sentou and Banjou. The suit designs are great, and the Belt Sounds for the most part are a lot of fun. It's an invigorating series with a mystery throughout its story that is interesting. There are some issues with the story in the latter half, and I'm not too fond of the OP for this one, but for the most part I don't have anything but good things to say about Build. It's a fun KR, and a great hypothetical introduction to the franchise.