Mostly very good to excellent, but with a few annoying "quirks."
We have the 2016 remodeled and redesigned Prius. While it really hits the mark in terms of fuel efficiency, reliability, and handling, it misses on some practical design elements.
The good: Fantastic mileage (50+ MPG overall), great reliability, excellent routine and emergency handling, excellent headlights, comfortable front seating, great safety features and safety rating, and "easy on the eyes."
The not-so-good: Poor storage space, especially up front and no place for tools. Terrible sun visors (nearly useless). Rear visibility partially obstructed. Very confusing and in some ways unusable instrument panel (e.g., no metric settings, extremely confusing/convoluted navigation that's almost impossible to use, cluttered with too much "useless" information, frequently self-resets, impossible to comprehend icons and symbols, very incomplete, but still huge, instruction manual), somewhat difficult to get in and out of, annoying Sirius satellite radio system that can't be eliminated (with never-ending mail advertisements), Also, no bumpers and low-slung design make it very vulnerable to dings and scratches.
Hopefully, Toyota has addressed many/most of the issues in the newer versions.