:welcome: from an owner (8 months) of a 2014 I Sport (albeit w/an auto tranny).
I'm a first time Mazda owner and absolutely love this car, especially the way the chassis is set-up. With the 2.0L engine, I sometimes (not often, but sometimes) wish it had a little more pull (torque) in the lower ends of 2nd and 3rd gears, but the upside is that the fuel efficiency (skyactive tech) is amazing. (I did not test drive the 2.5L for fear of wanting it, if I did so.) As always, there are (minor) things about which one might complain (and people do that--see discussion threads "What don't you like about the Mazda 3?" etc.).
There are many knowledgeable and friendly folks here on the forum as well as informative and insightful discussion threads that can be easily and effectively combed with the excellent search engine. If you can't find exactly what you're looking for, feel free to ask away!