From what little I used it (I got a rental), Arios was annoyingly bad... I honestly wouldn't pick it up unless you want Ascalon in the future (which could be a few months to a few years from now for NA) and even then, I have no idea how good Ascalon is aside from word of mouth (text of finger? I don't know... -__-').
That said, it was fun to hit-and-run with its dash. I also liked abusing the Slow effect on its W3.
So yeah, fun, buuut... I don't like saying it because I really did only use it a little, but I feel it actually is pretty bad... Probably the worst S-Rank I've ever used (aside from maybe the unbuffed "Beginner Three," but that was almost a year ago)... -__-'
Skill Status: Not Horribly Bad
Favorite Unit: Hi-Nu Gundam
Short Term Goal: N/A
Continuing Goal: C-Rank Army
Long Term Goal: Reach OC EX on all Nu Gundams (Nu, HWS, DFF, and Hi-Nu)