While the Matrix is very versatile, with the back seat folding fully flat, the seats themselves are a little less supportive than most would probably prefer. As is the case for most of Toyota's small-car lineup, the seats are quite short and flat. But there's enough adjustability between the seats and the tilt/telescopic steering wheel for most to get comfortable up front.
The rear bench is acceptable for adults around town, if not on a long road trip, but you'll only be able to fit two across. And overall, the tall-hatchback layout affords good interior space, with rear seatbacks that fold easily (and flat) to expand cargo space. You'll have no problem freeing up seating space for an especially large load of groceries.
Ride quality is pretty good—quite compliant for a hatchback with a sporty profile—but road noise can be an issue and a coarse engine note when pressed makes the Matrix no standout for refinement. Hard, dull interior plastics and unremarkable materials inside don't exactly boost that impression, although there's a lot to love in the simple, chunky control layout.