After following the fortunes of others here for more than a year, I finally installed a set of H&R Sport springs on my '13 CX-5 over the weekend and had a four wheel alignment done this morning. Originally ordered the springs from THMotorsports as they seemed to have the best deal. Unfortunately, they don't stock the item and had to special order it from H&M (presumably in Germany, though I'm not sure about that). After missing their first projected delivery date (about two weeks after I placed the order), I canceled and placed the order with Tire Rack, which was actually cheaper ($260 all in) and they had it to me the next day!
The installation was pretty straightforward, the worst part being breaking the 17mm nut loose that holds the upper collar on at the top of the front shock. Best to have an offset end wrench and a good quality long-ish 6mm allen wrench to do this. I used Corksport's online instruction sheet, which was helpful except for the fact that the torque values they gave were all wrong (compared to the Mazda WSM). I emailed Corksport about this and they have made the necessary corrections to their instructions.
The alignment went pretty well with only the camber on the right rear remaining 1/10 of a degree out of spec. Would have liked to see more consistency from side to side, but it is what it is with now way to adjust anything but toe. Will keep an eye on that corner for tire wear and start rotating every 5k miles instead of the normal 7.5k.
So far, I'm really pleased with the net result. The car now looks (to my eye) "planted" (not slammed) on its suspension and so far I haven't noticed any degradation in ride quality. I'm sure one of these days I'll drive down a really crappy road and think to myself "there's that damned "dead coil" in the rear, but the CX-5 always seemed like it had a rather stiff-ish ride anyway, and so far it doesn't seem any worse. Side benefits: I can now reach the middle of the top when washing the car, the 17" wheels/tires fit the wheel wells better and the view through the windshield seems noticeably lower in traffic so I don't feel quite so much like I'm still driving my old Nissan pickup. Well worth the total investment of $325 I would say!