I have an x200 and I absolutely love it. My previous laptop was an HP which got ~2.5 hours when it was brand new but was down to about 10 minutes after a year. My x200 gets about 10 hours of battery life with the wireless on. I have the solid state drive and the large battery. I use it all day in meetings for work without plugging it in. Granted its new right now, it's an portable type laptop while my HP wasn't so the comparison isn't completely fair, but I'm hoping that the battery keeps it up.
It has just been discovered that research causes cancer in rats.