Armia is a good player. His floor is 3rd line, but I think with more opportunity in a worse team he could blossom and become a solid 2nd line 50 point forward who plays an active power game. Middle 6 level is a reasonable expectation. At times he even looks like a first liner, but those are just blips as he doesn't quite have the finish/touch, hockey sense and offensive vision to make those plays/get into those areas consistently. Someone said he's like a winger version of Eller, and that isn't a bad comparison.
Like has been said already, he's a great forechecker. Hard worker, good skater, strong in cycle, in battles and on the PK. Good size, active stick, good reach with and without the puck. Has soft hands and can really dangle.
It doesn't solve the problems in terms of center ice or goalscoring, but it's a good and useful piece. Especially for a forward group that is so small in stature, it's a good addition.