I owned both X61 and T61. Great design, possibilities of modification, strong CPU, and good build quality that lasted for ages (I am still using the X61, now in

I owned both X61 and T61. Great design, possibilities of modification, strong CPU, and good build quality that lasted for ages (I am still using the X61, now in its 8 year). The model policies for the current models seems to have changed, though.