I love the ultimate it's probably the most useful thing if you could add it into League.
For example, much like Amumu's Bandage Toss and ultimate combo it is sometimes predictable and needs two spells to accomplish one task, however this ultimate does what it needs in one ability and with the Synergy of the other abilities such as Mach Punch, it can have more sustain in damage.
Basically I'd play her as a bruiser and charge up Mach Punch and initiate into the enemy team with my team, and with Calamity Drive and Mach Punch I'd punch one of the carries with the extra damage from Trinity Force.
The passive also gives you the freedom to build differently, it's not too gimmicky or at all gimmicky. It's pretty simple, and easy to understand, however Beta Unit, could be overpowered giving %15 bonus attack damage.
Overall solid champion, looks like major fun, and a great addition.