I own a Lenovo Thinkpad 550 and the build quality is fine but nowhere near Apple MBP. Bought it because it runs Linux w/o hassles, has an Ethernet port and it costs like less than half the price of the MBP. The screen is also crap compared to Apple MBP.

Apple MBP is nice, but lacks Ethernet, a headphone jack, function keys and a SD card reader, all deal breakers to me. And no, dongles don't qualify.