I find the changes to Nano Heal from the Essence of Notum perk line a mixed bag of "yay" and "awww".
Yay because of the halved recharge. Awww, because instead of healing nano by a static amount (4000) it now has a range of 2.4k-4k.
I know I know, technically over time it's more nano, but NTs most often use this in one of two situations:
To boost nano while taking damage under nanobot guard,
To heal up nano after using nanobot guard.
Otherwise it doesn't get touched. There's little use in knowing I get another shot in 60s, if the amount it healed for was only 2.4k as opposed to the current 4k I know I'll get right now because in 60s NBG will be out so that shorter recharge makes very little difference.
I do like the shorter attack time on Tap Notum Source though, it's a shame the lockout is still 6 minutes.