Interesting that they are going in-line. I've driven BMW's with that and it is a very smooth configuration (somewhere between a V motor and a Rotary).
Wife's car is an Infiniti Q50 Red Sport 400 with a 3.0L V6 twin turbo cranking out (surprise) 400hp. It is quick and the dual, small turbo's spool up with almost no noticeable lag but like most turbo cars torque seems scant.
An interesting offering to be sure, but I'll stick with my V8's as long as I possibly can !