So I recently came up with an idea for a new weapon for scout

So essentially, imagine those hand held grinders? Yeah, well it would replace your primary slot, so the stats would look something like this:

(+) : No ammo required

(+) : On Hit: Builds agitation

(+) : Alt Fire: Gain a massive speed boost for 8 seconds plus 30% resistance to all damages

(-) : does no damage to buildings

(-) Your stuck at melee range

(-) no random crits

Neutral stats: automatic melee, so get close and personal!

Base damage would be like 30-50 a second.

So the big question is, how balanced would this be?