I am using the plastic blades and they work very well.
I have plenty of lift and they needed no balancing or tracking adjustments.
I bought the yellow ones thinking it would be easier to see the disc and it is!
Heliko you are right about the weak link in the chain but so far the trade off
has been worth it for me. I guess it is a gamble but this one has paid off so far.
Thats not to say these are for everyone but if you want to fly upright I think these are sweet.
Of course these will only benefit those who already can hover fairly well.
If you do not have the hang of it yet then don't expect miracles from these blades.