Aussie Jib with 40mm Harken Carbo AirBlocks?

Does anyone have any thoughts around using 40mm Harken Carbo AirBlocks blocks to replace the fiddle and becket blocks in the aussie jib system? I came across this page on Harken's site: http://www.harken.com/DeckLayout.aspx?id=15452 and it got me thinking. Is there any advantage or disadvantage to using these? Would replacing the existing aussie system with these blocks still be class legal? Which blocks is Hobie currently using on new production boats? Is it still 20810041 and the Hi-Load becket H099?

I think they are not really suited myself.

The standard ronstan block that comes with the new boats (the one that attaches to the tops of the Jib) has failed for a number of sailors at my club.

A lot of people have replaced it with either Harkan 312 or 313 blocks. I got the 313 block which has a working load of 680kgs vs around 250kgs of the stock ronstan block.

The standard fiddle block that comes with the boat seems fine though, most people replace it when the wire pigtail starts to give before the actual block in my experience.