I used Wizzair (Ukraine) last year to fly from Kiev to Valencia and was quite impressed, the service was very good.
It's a pity they don't fly from Liverpool to either Kiev or Lviv, the only way to get to Ukraine is via London.
After flying with BA from Heathrow a few times you hear quite a lot of passengers saying we need a direct route from Manchester or Liverpool, if it ever happens I hope it will be Wizz.