Heyah now has the one thing that Play Fresh had that it didn't, namely 1-year account validity. But instead of being after every topup, this is British-style, i.e. after every call, MMS, SMS (presumably including free ones within Heyah), or use of data. This also means that Heyah is now a pretty obvious choice for infrequent visitors to Poland who wish to keep their accounts valid without having to top up all the time.
Heyah - Absurdalnie proste zasady, darmowe rozmowy i SMSy ze wszystkimi w Heyah - Na Kart? - Heyah Mix