My vote as well. I got a series 2 around 3 years ago now and it's the best chair I've had. I work from home and spend most my free time on a machine so I'm sitting like 10+ hours a day in this and it's still going strong. My back hurts less, my hips hurt less, just a good sturdy chair
Edit to add: My spouse actually does not like these chairs because they're super uncomfortable to sit in with bad posture. That's part of why I like mine because I'm basically forced to use good posture. So if you need a chair that lets you sit like a gremlin a series 2 might not work well