Otherwise...it's a FLIRT (technically a METRO[1] I think, but roughly the same thing in terms of appearance) - same as all the others - and good kit!
I don't think that's right. METRO is supposed based on the Berlin underground which is based on Tango. To be fair there's a ton of overlap in terms of components, but it looks likte the key difference is that METRO has components and traction that can be fitted throughout the train (no larger bogies for traction, no traction cupboards), whereas FLIRT puts traction in specific location (motor bogie + transformers behind the cab, and occasionally additional motor bogies in the middle for longer FLIRT's).
Case in point: the 777 has motors on all the jacob's bogies, none on the end bogies. All Flirt's are motored end-bogies, and additional non-jacob's bogies in the middle of some longer trains (PKP, SOB, and the 745).
Unrelated, but in case it's not already mentioned: Stadler claim these units are ready for ERTMS and dual-voltage conversion.