It might be worth it on an Elipsa or a Sage (after a *significant* delay, I mean), because its sunxi SoC has terrible power management, even in suspend; not so much on a Forma, where the difference between suspend and off is barely significant; *especially* if you actively use your device.
(I'd give you numbers, but I can't find 'em

. It's 21mA for an Elipsa, though, and that's... very much not great.).
(FWIW, mine are setup to power down after 14 days of inactivity. But you can"t do that in Nickel ;o)).