[yoodenvranx]

I am still using several T61 and T420 for web browsing and light work. Compared to those thin and flimsy modern ultrabooks those the old T series are almost indestructible.

And if something breaks you can easily replace everything with a screwdriver and cheap replacement parts.

[fencepost]

And service manuals. Don't forget that at least for the business lines Lenovo seems to have great availability of service manuals (pcsupport.lenovo.com)