Went to have a brief look at a CX3 in sports-nav spec on Saturday at the launch event, just in case it was a viable alternative to the CX5 when I replace mine later this year. Realistically, it's not going to be due to the size of the boot. Otherwise, it's a cracking motor. Interior layout is very good, seats are comfortable, similar headroom to the CX5 but slightly less legroom. Seat was right back and down for me, but that left only about 75mm legroom behind my seat, so four big adults would struggle. Boot has a two level floor, but - on the sport nav - you can't use the lower level as the Bose subwoofer sits in the middle wheel space and is too high! Feels very well put together overall. Wasn't able to drive it but did hear it running; the 1.5l, 105HP diesel sounds very quiet.
Once again, the Mazda demo guys didn't seem very well informed regarding spec and options available.
Alan