Had 3 years with an Alfa MiTo QV (same enigine in the same 125kw/250nm tune) and the car had zero warranty issues.The car is rock solid. Almost all the newer cars are, so much so that Consumer Reports has drastically altered their standards for what "reliable" means. As an example, they rate the Fiat 500L very poorly in reliability, but if you look at the actual list of issues, none are really reliability issues. Cup holder won't hold a Super Big Gulp, point off! Nav system requires you to read the instructions, points off, transmission works perfectly, but shifts "abruptly" points off (I guess they want it to slip....)
The 124 will likely prove to be very reliable. I have had zero problems with these engines in three other cars.