it is very reliable, but you need to take care of it. its quick though, only takes a couple of minutes to clean and lube all that needs lubing. the first generation did have some issues, but now everything is fine.
there are a couple issues that tend to show up here on the forums, but they are mostly easy to deal with yourself. one is the solenoid sticking, so it wont shoot on the first couple of trigger pulls. very easy fix, just clean your solenoid. the whole solenoid in general is a little finicky. its a "new patentend proprietary Slipstream™ solenoid" but i dont know what solenoids are like in other guns since i dont own any others. so you might encounter that issue after a while and some grease or dirt gets into it.
people used to have lots of issues with the poppet, but the new ones dont have that issue, except in rare cases. it can also be reset easily by turning the backcap all the way in.