Skill-based Medigun idea

[Mr_Noname]

I had this idea for a Medigun this morning:

The Advanced Procedure
Level 10 Medigun
+100% Ubercharge wear-off time*
-20% Heal rate

*AKA twice as much time of still-invulnerable fizzle after Uber is gone/moved to another patient.

The reasoning behind this weapon is similar to the reasoning behind the Degreaser. Make a weapon that is rewarding to players with skill. The Degreaser rewards a player for using more than one weapon. This rewards a medic for Ubering two patients at once. The extra Uber time is insignificant for a Pocketing Medic, but could be extremely useful for a Medic with a knack for double-Ubering.

What does SPUF think of this idea? Do you believe it is balanced?
Do you have any ideas for an alternate downside?

[20 Sentry Fox]

Not sure whether not it´d be balanced in this form, probably not, but I actually like the core concept of this one.

I would like it even more if the heal rate penalty would be a little steeper, not only to make up for an upside of this size, but also to allow Medics charging their uber even faster.