Had Lion on my W520, worked pretty well, after having to change WiFi card to Apple compatible. GPU was Nvidia only. Couple of other minor niggles. Somewhere around Mavericks/Yosemite it became more trouble than it was worth.
Having seen announced machine, and the price, I'm going Linux for next laptop. Might try to get a mini from ebay.
Had Lion on my W520, worked pretty well, after having to change WiFi card to Apple compatible. GPU was Nvidia only. Couple of other minor niggles. Somewhere around Mavericks/Yosemite it became more trouble than it was worth.
Having seen announced machine, and the price, I'm going Linux for next laptop. Might try to get a mini from ebay.