EPDM synthetic rubber for flat garage roof

Dear ALL
My existing garage roof starts to leak, and I got a quot to replace it. As the materials needed for EPDM synthetic rubber is only one-third of the quot price, and having a very tight budget, I would like to ask whether anyone out there has experience of using this new material? From their instructions, it seems that the material has made it easy for any DIY-er.
Many thanks for your advice.
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