I can say Wizzair is the worst company I've even flew with. I travelled with so many companies around the world including low cost and none was as bad as wizzair. I am a frequent traveller and flying with Wizz to Sibiu and back to London at least once a month, sometimes more. ALWAYS with delay. There is always an excuse with them, they NEVER EVER took off on time, you can't ever rely on them, it's absolutely horrible. The landing time to Sibiu is 2am and they make it 3am with their delays. They always find a good excuse for this, either air traffic control, or weather, or whatever but I've never seen such an unprofessional airline. Complete lack of respect to passengers. I only use it because it's the only airline with a direct flight London-Sibiu. They are horrible.
Also legroom does not exist, it is always a very busy and stressful flight, extremely bad conditions. During peak times, ie summer, Christmas, etc, the prices are higher than the other companies which aren't low cost like Austrian or Lufthansa. Their luggage policy is terrible as well. Overall they are simply horrendous on everything.