UPDATE (55000 mile): Still driving my Si and aside from routine maintenance, there's been ZERO mechanical, electrical, nor physical problems! Great car! To gain horsepower (~36), torque, and engine responsiveness, I've added a cold air intake, 2.5" stainless downpipe with catted exhaust, and remapped / retuned my ECU with Hondata software and Vit Viper online tech services (a fun project, but realistically, great gains can be had with just the CAI and Hondata and forgoing exhaust changes).
ORIGINAL: After driving a 2002 WRX, 2009 Forester XT (turbo), a tuned 1990's Altima (w/ slip diff), I'm happy to say the new Si is the best of them all!
Road & wind noise are minimized, hearing only the rough & grumble growl of the engine. A buttery smooth clutch with short throws is easy & fun. Front slip diff performs remarkably, & even makes driving on all season 17" / 45s in snow & slush tolerable (I normally have snow tires). Ergos are nice, especially the back split fold down seats, center arm rest, matched int colors, & standard back-up camera.
Of course there could be more space & luxury, like an Acura TSX or Audi A4. But then again, you won't pay $30k++ for the Si!