The next question would be: "What can go wrong?" The downside of AC modules is the fact that all the inverters are on the roof and subjected to weather changes. Instead of one inverter, you have several, and if one of them breaks down, it is troublesome to climb the roof and fix it. Microinverters are sturdy, but if extreme weather conditions are common in your area, a
rooftop system out of AC modules might not be a good idea.
What is more, AC modules usually end up being more expensive than standard panels plus an inverter. An installation out of AC panels can cost around 20-30% more than a traditional system. However, we've already mentioned that you are likely to replace your string inverter halfway through the lifetime of the panels, so the costs balance out in the end.
Finally, AC solar panels are problematic to use in hybrid and
off-grid systems, because solar batteries are usually charged with direct current. If you need energy storage with these modules, you can find AC batteries on the market. They are easy to install, but are slightly less efficient than standard DC ones.