Comfy, but stinky
Had the thinner/basic purple cushion on my computer chair for years (came free with our mattress), but started getting a sore tailbone sitting too long (> ~90 minutes) even with breaks every half hour or so.  The thicker cushion is definitely an improvement; I've not had any pain since swapping out.<br /><br />This thing is huge, I recommend measuring your chair (distance between armrests, etc) before buying.  Fits my chair fine, and was a lot cheaper than considering a new chair.<br /><br />It's also quite a noticeable height boost, so keep that in mind.  In my case the hydraulic cylinder in my chair is shot so the height boost was most welcome, but I did have to readjust my under desk keyboard mount slightly.<br /><br />Finally I'm sure the smell will dissipate over time, but this was a particularly stinky product as compared to other purple products.  We've also got purple pillows, and those took a while to mellow out.  It's gotten better over a few days, but still noticeable.  Kind of like sitting behind a truck in traffic.
Rating: 4 stars