I was skeptical about the mesh thinking it wouldn't give enough and hurt my rear or give too much and not give my back enough support but it's perfect. No pain in either body part despite sitting all day! Great lumbar support! Best desk chair I've ever used - wish I'd replaced the old one much sooner! Not hard to put together - took just over an hour - needed a bit of help centering the seat on the center pole and with getting the headpiece situated correctly and bolted on. And I love the blue! Fantastic!