Yes, partypoker is safe and legit. The experts at CardsChat have done an extensive check and are satisfied with the security measures in place. Security methods include:
128-bit SSL encryption to keep data safe.
Systems to test games are operating fairly and randomly.
Systems to perform random security checks to identify collusion or cheating by players.
It is licensed and regulated by the UK Gambling Commission and the Government of Gibraltar.
It has the eCOGRA seal of approval for player protection.