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Its not the shape of them bud, its the reason they break go out of shape quick is because they are cheap for a reason (they are made cheaply not the same as powerflex/superflex)
I've got to admit, i'm not impressed after seeing your pics. Its clear the design has changes but like you say it doesn't make the anymore reliable.
Good bit of info that mate. Need to mull over what i'm going to do now.
Bud look at it this way, with superflex/powerflex buy once buy happy or flowflex buy once then have to buy poweflex/superflex anyway putting yourself out of pocket. (or you maybe one of the very lucky ones and have no problems) but if you read through them threads along with this and a few other threads there is hardly any happy customers!