As for open boot, I understand the X220 supports both coreboot and libreboot, but I don't use either, so I can't comment on it in detail.
As for open boot, I understand the X220 supports both coreboot and libreboot, but I don't use either, so I can't comment on it in detail.
I would like to get an 802.11ac card for it at some point and that's about it. It came with a 6-cell battery with 70% capacity left, and I've put a new 2Power 9-cell battery in it, getting around 6-7 hours battery life as you say. I would sort of like to have an external charger so I could always have both batteries topped up, but they seem to be rare as hen's teeth.
In my opinion, the X220 is probably the best Thinkpad ever made. The i3 isn't a problem, I used a T42 for years and years despite its slow-ass Pentium-M, and I only sold it because a lot of Linux distros started going 64-bit only.
I have bought a couple of newer Thinkpads but they end up reverting to my x220. x230 is almost as good but doesn't have the old school keyboard.
On reddit.com/r/thinkpad there is huge following for moding them.. My only recommendation is to ensure it you have an SSD and load up on RAM.
I'd love to find one damn laptop that we know works well.
By saying that, the 2018 generation of ThinkPads finally includes excellent panels. If you get the new X1C or T480(s), you can choose a bright IPS panel with a good resolution. With the old ThinkPads, especially X220/X230 you just need to be VERY sure you DO NOT get the TN panels.
[0] https://www.ebay.com/itm/Lenovo-ThinkPad-X220-Laptop-Core-i7...
Personally I care more about ruggedness (my X220i is my travel computer) than color fidelity. Compared to my old Acer Chromebook 13's absolutely horrible TN panel, the one in the X220i is actually quite decent.
Still, from what I gather the IPS panels suck a bit more power than the TN panels (not a huge difference, though), and for my use (travel PC getting lugged all over the world in hand luggage) I'm primarily interested in ruggedness and battery life. I use it to browse and read email, with the occasional Youtube video, not for anything color critical. I would be much more interested in upgrading the mediocre built-in speakers, apparently you can use the speaker from a Nexus 6P for a nice boost in volume and quality.
The display is vastly superior. Everything is more crisp, and it is brighter.
The X220 is still fast enough for Chrome / YouTube / Netflix without spinning up the fan. Running a high res external display is a bit too much though; the fan kicks in most of the time.