Seeing as no one has an opinion and I don't know anything about PAMM accounts myself a quick scan on AI would indicate that the broker you choose is paramount, as in one with a sound reputation.
I would definitely keep away from any unregulated brokers trying this out.
Edit, I should say that I know the posted returns were for comment rather than the system itself but really they can easily be faked, try comparing their statements with a legit broker and see. Research the broker rather than the system.
for anyone interested I can save you a few key strokes;