All block chain technologies have scale-ability and fee problems. IOTA uses a new "tangle" data structure - not block chain. It is fee-less and has no scale-ability issues. The more users that use the IOTA network - the faster it runs. IOTA really is a brilliant solution. In my opinion IOTA could replace all block chain coins.
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If only I had some wonga to invest. IOTA would be in my portfolio for sure.
I'm also interested in IOTA , it really sounds like the future of crypto