I travel a lot with WizzAir and i think that grosso modo, WizzAir is a good cheap airline, mainly, you get what you pay for, so don't expect anything luxurious. Definately, some rules are too rough or there's room for better services... In the future they should think of
a better custom loyalty program, also, they could launch more new routes, especially to sunny destinations where interest is very high (and they should keep those flights even off-season in may or octomber). Overall I would recommend choosing WizzAir, it's a good deal.