Yeah I definitely have experienced more delays with them than with Ryanair. I rarely experience any meaningful delays in arrival time with Ryanair, so I'd say they are the best deal to service ratio.

Wizz cancelled a flight, gave me an advanced warning 2 days ahead, cancelled also all future flights on that route. Since I booked through an agent, didn't offer anything beyond monopoly points. Ended up going through my credit card company to get it refunded. It was quite a hassle to find a replacement flight flying reasonably close to my destination. That one was with Ryanair and everything worked out excellent with them.