My Volvo (P80 platform) seats are pretty nice. They're my first leather seats. I've never really liked leather... natural vinyl??? My issue is that they tend to be cold in the winter. I haven't really had an issue with them being too hot, but MI isn't super hot. We do get a lot of humidity, but probably still not as bad as some other areas. My best reccomendation for them is that other than temp, they never make me think about them.
The seats I didn't like were in my 2004 Malibu. I often felt like my head was being pushed forward, even though the seat wasn't actually touching the back of my head. I think it was the way it curved by back. I'd often get a headache, or if I already had one it would make it worse.
The seats in my Saturn were decent... you sort of sat in them, as opposed to sitting on them. I felt the same way comparing the seats between my 86.5 Supra and my 82 Dodge Charger. In the Supra, on the Charger.
I don't like the modern "cloth" that the manufacturers are using. It is not nice feeling, and it stains easily. My Malibu had it, and at first I liked it. I thought it look great in a no-nonsense sort of way, but quickly found that it stained easily and was just cheap. I like the velour type material my truck has.
