For me, it's the HM chairs plastic front stabbing the back of my thighs! I gather this is similar to cilantro tasking like soap; a significant minority is bothered by it, but most people don't mind.
+1 for the Steelcase Leap V2, look for a used one, brand new prices are ridiculous. Lots of office spaces sell these off for cheap.
Haven’t tried the V2 but I had a good run with a Leap V1 though boy were they pissed when I tried to get service for one I bought on Ebay. (After several years of using it… They fixed it just fine in the end though)
I really like it for back support, also you can get it with a built in headrest
+1 as well. Because the Aeron is so iconic, they seem to retain value much better, so they are expensive in the secondary market. Leaps are cheaper, but I personally think the Leap is a better chair.