I love my Thinkpad. It's had all sorts of tortuous treatment and just keeps on ticking. It was kind of amazing the first time I spilt water on it to have it drain out through the holes in the bottom of it and just keep going (I've also stepped on it, dropped it, etc; I'm actually very careful with my computers, but when you work with it 14+ hours a day for a few years, sooner or later you're going to do something stupid with it).
I have the x61, which is great. If I were buying one today, I'd probably get one of the x300 series; they seem to have a slower CPU than the x61 (and x200), but faster graphics, and better screen resolution. CPUs are fast enough that it almost doesn't matter these days (for web dev anyway), but faster graphics are always good -- I really feel the screen redraw when switching desktops with it plugged into my 26 inch monitor (still, this machine is like, 2.5 years old).
For me, having a lightweight and portable machine is pretty key. I also have an MBP (15 inch), but it's so much more work to throw into my backpack and lug around. I always have my Thinkpad with me, which is a huge part of what makes it valuable.
I have the X61s, totally maxed out the 9 cell battery, 1.8Ghz ULV processor, 4GB ram, and a 7200RPM 160GB hard drive. It still feels faster than most other laptops after more than two years. I had to replace the battery, which was okay because they had them at the lenovo outlet for 45 bucks, and so now I get 6+ hours (true) battery life once again.
Way better than my original first-run 13" white macbook. That being said, I started a new job and I'm getting a maxed out 15" macbook pro. I miss Mac OS, and I'll be living in an IDE, so that's why I chose the macbook. Otherwise it'd be a hard choice between a macbook and a T400S.
Oh, forgot to mention: I've been running Ubuntu on it exclusively for the last few years. Suspend and resume has been flakey in some releases of Ubuntu, ok in others (I've given up trying, honestly), but otherwise the hardware support has been flawless.
I have the x61, which is great. If I were buying one today, I'd probably get one of the x300 series; they seem to have a slower CPU than the x61 (and x200), but faster graphics, and better screen resolution. CPUs are fast enough that it almost doesn't matter these days (for web dev anyway), but faster graphics are always good -- I really feel the screen redraw when switching desktops with it plugged into my 26 inch monitor (still, this machine is like, 2.5 years old).
For me, having a lightweight and portable machine is pretty key. I also have an MBP (15 inch), but it's so much more work to throw into my backpack and lug around. I always have my Thinkpad with me, which is a huge part of what makes it valuable.
... Man, I am such a fanboy! :)