Perhaps wait for a sag. Peter Lynch says "buy what you know", and I add "as long as it has upside". Most IPO's lose their lustre after the offering, and sometimes an IPO is only an eventual cash-out for the principles and the IB. And not a great report from Matador: you gotta have chain.
That said, I believe in the philosophy and products, so it is on my watch list for a "buy when bloody" .
RPI is "penny shares", that might have limited liquidity at first, and i hope that does not delay an ADR for US retail investors. The volume demand has to be there. THEN you have a chance to own a "chat room stock", which can provide for some interesting entertainment.
Go Pi!
Mike