While the Fi21 might be the smaller brother to the all-new Fi23, it still lives up to the bigger hype. This, by and large, is due to the excellent design of Centurion's new Opti-V hull. The hull creates a wake that not only has a great shape, but that is even, consistent, and highly customizable thanks to the option onboard systems available. This allows riders to quickly fill up ballast and be riding or surfing, rather than having to spend time tweaking settings or moving bodies around. When tested with plug-and-play ballast, the wakes and waves on the Fi21 were sizable and a lot of fun.