We test drove one in the summer and were not disappointed, however we settled on a low km 2014 Mazda3 hatchback instead. I appreciated the higher clearance of the CX-30 and if there were used ones on the market I might have been swayed. We had an '06 Mazda 3 hatch from new and now have the 2014. A few years down the road when there are used CX-30's around I will probably take another look. I just cannot justify the price tag of a new one at the moment!
My dad also test drove one after we did. He really liked it, but his golf clubs did not fit so he ended up with a CX-5. We all have different priorities! What are yours?
The only other 'con' for me was actually that it is a taller vehicle. I use the roof of my Mazda 3 for skis, bikes, and our Thule box. I can reach almost everything from the ground without having to climb all over the car. I am capable of adapting, but for now am happy with the status quo!