I have ridden the original RX8’s for the last year and a half and while not perfect, they’ve been awesome gravel/xc/cx all rounders.
These newer RX 801’s seem to pick up exactly where the older version left off. The heel cup hugs well, enabling you to loosen the boa if needed to let your feet wake up or adjust for any hot spots from over tight boa cord. The boas are way better on the 801s in that when you pop them open, they loosen the cord very easily where the older shoe was a bear to pull slack through the boa. The 801 also removes the elastic strap on the instep/inside of the shoe making it a lot easier to get them on and off without any compromise in snugness or security when they’re on. The soles are as stiff as I’d ever want and overall they’re pretty light. The insoles don’t do anything (even with Shimano “high” arch insert) to support my high arches so I had to use some custom insoles which make the shoe a little heavier, but far more comfortable and supportive for my feet. At sale prices, you’d be hard pressed to find a better shoe, as long as it fits your foot.