Past: Lenovo R61e Worked beautifully and it still runs perfectly with Ubuntu. Its about 10 years old now. Only downside was the display which had their anti-glare thing and it was a bit dull.

Current: MBP 2012 Works fine. Upgraded to SSD and 16GB ram. DVD player stoppped working. Trackpad needs adjustment and/or replacement. I run OSX and virtualize everything else. Would buy a MBP as next machine if I can upgrade (none of that soldered on parts).