Talking sidevalves Big 4 flat tankers

Hi everyone hope we are all having a great weekend on my continued quest to decide what flat tank Norton to look for (currently leaning towards the Model 18) I've also been looking at old Pictures of the side valve flat tankers got quite taken with the big 4s.

Just wondering has anyone rode one as a solo if so what do you think, an has anyone rode one in comparison to a 16h sidevalve flat tank or model 18

Thanks in advance.

Tom