Agreed. The pictures of the Pro make it look quite flimsy. The Pro XL looks bigger, and a fair bit wider than the S300, but I don't want to go too far in the other direction and have one that too big. I'm average height ~6ft and normal build, so i think the S300 is probably the best fit. On the topic of price, i was thinking to hold fire until after this lockdown is over and people get back to the office, to see how prices fair then, but i stupidly got rid of my old office chair yesterday in readiness for a replacement, so am stuck with using a dining room chair until i make a choice. Doh!