I haven't used this system but have used other power steering systems with out problems.
It claims low amp draw but doesn't say how low. I guess if your batteries have enough capacity it's no different to having lots of electronic instruments or a radar running except that its running all the time your at sea and you won't switch it on intermittently like you might a radar. I'd of thought your out board should be able to keep the batteries topped up sufficiently though.
What engine are you going for? The regular hydraulic systems work fine on all size outboards from experience and the power systems only feel a little lighter than a well maintained hydraulic system.
How many turns lock to lock is this system? Some hydraulic systems are up to 5 turns which can be a bit of a pain when doing a lot of close quarter manoeuvring.
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Freelance skipper, RYA Powerboat Trainer and Advanced Examiner