I see they have a management fee of 0.65%. The smartFONZ etc also have a management fee of about 0.6%. Are you going to be stung twice for management fees, I couldn't see anything that said you wouldn't be. It's probably worth back testing the shares and seeing how it performs with a 200 day MA. FNZ.NZ is smartFONZ, I'm sure it is possible to find the other ones too.
Also how often can you change between the different funds, it may be restricted to x times per year?