Do any of you own one of these? A co-worker is selling one and after having a chance to sit in it I have so say it's about the most ocomfortable damn chair I've ever been in. Are they all like this? Does that initial comfort wear off after owning it? And how much do they generally go for new? He's asking $900, which seems a little pricey for a chair that's only in good shape. The base is scuffed up and the leather is a little beat up in places too, but it's so damn comfy I want one of these chairs now. If they sell new for $2000 or something like that, $900 starts to look like a better deal. Thanks.