First post to unlock my account:
Upgrading my ssh tunnel Slackware box, and I was unable to figure out the partitions using a USB stick as the Slackware /dev/sda "drive".

Normally I just fdisk, create swap, create /dev/sda2 and installer is off and working.

No love with cgdisk, tried figuring it out multiple times.
Installed Slackintosh fine, after figuring out iPhruity-device partitions.

I just threw in my old Crucial/Micron RealSSD m4 nightmare SSD, and it booted and functioned w/out issue.

Had to mod some config files to make eth1, eth0 again, but nicely working now, thanks to LinuxQuestions.org.

Verified all is good with slapt-get, and I'm off.

Unless you really want to use a boot drive over some number of terabytes (two?) you don't need to use UEFI. I'd recommend against it. I use a small (way under a TB) SSD for OS and larger (TBs) HDD for storage.

Why?

IME, it's quicker, easier to use, and more flexible than legacy/MBR.

Actually it's not.

1 members found this post helpful.

Clearly, your experience differs from mine.

I've found UEFI to be quite easy on my motherboards. Once I figured out elilo (it's really not that much different than lilo), it became super easy to upgrade my kernels. For people who have a properly working UEFI firmware, I don't see any reason to not switch to UEFI booting unless you just don't want to learn how (which CSM/legacy will eventually be phased out -- although, who knows how many years this will take). I've never had a need to look into alternative bootloaders like grub or refind, so I can't comment on whether they are simple or difficult to use.

If you have a broken UEFI firmware, maybe it'd be best to stick with legacy (if it supports it) or choose a different manufacturer next time. So far, my UEFI motherboards have been MSI, Gigabyte, and ASRock and all have made using UEFI booting simple.

2 members found this post helpful.

My UEFI motherboards have been only ASUS so far and I did not have any problems.
I use ELILO and the only problem was the syntax of the configuration file.
I do not like GRUB, it's too complicated for me (although I'm using it on Ubuntu workstations), but the rEFInd CD is always next to servers alongside the Slackware DVD.
When I had to change the Slackware system motherboard rEFInd was the easiest way to boot for reinstall ELILO.