It looks good in theory. But it also depends on what you're keeping. If you're feeding common fish like clownfish/anthias, then it sounds like a pretty swell idea. But where's the fun in keeping an aquarium if you don't feed your tank?
From being a part of some seahorse groups and having perused fusedjaw back when it was still active, I don't think this would be very effective with fish that need high quality frozen food. The act of thawing and refreezing foods reduces the quality of frozen foods. Take a look at this article from fusedjaw using the waybackmachine: http://web.archive.org/web/20150206...zen-mysis-part-1-the-quest-for-quality-mysis/ . If you're keeping seahorses, I probably wouldn't go with a feeder like this due to the nutrient disparities, and stick to defrosting mysis when I'm available to feed the fish.
If you're looking to raise fish larvae, most larvae are like Jurassic Park's T. rex: they have movement based hunting strategies. Unless you're trying to maintain greenwater conditions throughout the day, I don't think this would be a good feeder for fish larvae that still need active foods. Post-metamorphosis, when the larvae can be weaned onto frozen/prepared though? Sounds like a great idea, as long as you feed high quality foods.