I did the Beta testing for Corksport and used the exhaust for about 500 miles.
My car is a 2WD automatic and I also have the Corksport intake for the CX-5 installed, but the exhaust sound has masked all the noise from the intake.
The sound overall is okay, I come from the Subaru community and drove a highly modified WRX for years so I can appreciate the exhaust note, but with the volume(interior size) of the cabin it does tend to be a bit loud and drone at times. I noticed when the vehicle is cold on a very light acceleration at low RPM the entire tailgate rattled. It only happened on one occasion but was very pronounced.
After a cold start, the initial warm up period (about 30 sec.) while in Park is very loud both inside and outside the car. If I start the car while my kids are asleep I immediately put the transmission in gear to prevent the excessive noise so they don't wake up.
Cruising at speeds at or below 75 MPH (2600 RPM) is pleasant but above 75 MPH the sound level starts to be more noticeable and could be an issue on longer drives.
If this exhaust was going on a Mazda3 I would say the volume is fine, but since the target demographic for the CX-5 is young families I would have liked to have a little more subtle and refined interior exhaust note.
The fit and finish are excellent. I used ramps on the back wheels and total time was about 30 min for the install. Included with the exhaust was a gasket, but there was not a factory gasket installed when i removed the stock exhaust. I might suggest telling people they will need a deep socket set for the install.
Ultimately I decided not to keep the exhaust. It was just too loud inside for city driving and i noticed no increase in performance or fuel economy.
The video below is marginal but it's all I have.
http://s751.beta.photobucket.com/user/hiflyer731/media/CX-5/MVI_2059.mp4.html