The t60 was the last model built when IBM still owned the laptop division. Spun off, Lenovo commoditized and did not keep up the QA. In my org, t60's were widely coveted, hand updated (ssd's, memory) and kept over newer offerings.
The latest T's and X's are better, but your average 60p has a better monitor than nearly all of the current tpad line.
T60ps were built by Lenovo and some outright carried the Lenovo badge. You could claim the design has gone downhill, but the build quality is Lenovo's.
Looking at the IPS-equipped X220 for my next laptop :)
Well... my 2006 T60p is in great shape. Original hard drive, battery only 14.7% down from its original capacity.
My 2004 X31 is still ticking and it's been through a lot. Zero problems with the electronics although to be fair I did upgrade the hard drive in 2007.