From my experience Power World Gym is ok. But remember the facilities and equipment available will differ from branch to branch. If you are going to the Gym during peak times, you'd better check that there are enough machines/equipment (typically many sets of the same machine/equipment) for a bunch of people or you would end up waiting for the machines/equipment to free up.
You may need the assistance of a trainer, so check if there are sufficient trainers available when you attend.
Good luck.