I have bins full of dead HPs, Sonys, Gateways, Acers, but Lenovo failures are rare in my shop (only ones I've had issues with are the G500 Series with bad video).
Lenovo is way at the top - then HP somewhere in the middle, and Dell and Vaio are in the bottom.
Brand name is nothing more than a sticker. Neither IBM or Lenovo actually "make" a laptop. And they buy them from the same ODM's as HP, Sony, Dell, Gateway, Acer.http://en.wikipedia.org/wiki/List_of_laptop_brands_and_manufacturers
The vast majority of laptops on the market (94% in 2011) are manufactured by a small handful of Taiwan-based Original Design Manufacturers (ODM), although their production bases are located mostly in mainland China. Major relationships include:
Quanta sells to (among others) HP, Lenovo, Apple, Acer, Toshiba, Dell, Sony, Fujitsu and NEC
Compal sells to (among others) Acer, Dell, Toshiba, Lenovo and HP/Compaq
Wistron (former manufacturing & design division of Acer) sells to Dell, Acer, Lenovo and HP
Inventec sells to Toshiba, HP and Lenovo
Pegatron sells to Asus, Toshiba, Apple, Dell and Acer
Foxconn sells to Asus, Dell, HP and Apple
Flextronics (former Arima Computer Corporation notebook division) sells to HP