At the current stage now, there's nothing to 'buy' yet. You are only 'pledging'. Wait and see if they make the Nov/Dec 2015 estimate and deliver a finished product to backers, then wait for reviews. There's always the chance it might end up being a dud or the project might fail with nothing delivered.
Think this project is categorized under 'technology', where the project success rate is 20%, or about 1 in 5 projects.