Also, got to play with this card a lot:
And its basically just great. The entire point of these cards is to stress removal suites in tempo-shells, so the fact that it can't hit creatures is irrelevent something like 99% of the time. Most of the time its just a blatent misplay to not take the removal piece, and if they have no removal for whatever reason, duress hits all of the haymakers you care about, stressing there removal suite down the line when they finally find removal,
and stressing there mana, which is the entire point of the design of these cards.
Meanwhile the body is a great tempo body to attach removal disruption to. During the 4-5 turns where katesail is waiting to get blasted, its actually capable of doing something relevent, unlike mes friend, which just sits there useless. And if for some bizarre reason you do miss, you at least get an evasive flyer, that can effectively pressure, fog
anything for a turn (rather than just ground pounders), and occastionally holds off entire waves of multiple 1/1 tokens.
The body and entire design makes far more sense than mes fiend. These are supposed to be tempo cards, that stress the removal suite of a deck, and as such, should slot naturally into a black tempo shell--a shell which wants evasive pressure and removal disruption.
A 1/2 flying body that disrupts removal while pressuring is awesome, while a 1/1 body that disrupts removal, while not pressuring, is confused about its place in the world.