I don't know a ton about crowdfunding... but what could be the downside of using Kickstarter? Seems to me that it comes with free audience and offers some security for the backers.
In addition to that, with this wordpress-style version, you get to use your own URL/and customize the branding if you want, the users become your users, it's your credit card processing (so you get that data too for future up-sells or feature purchases), and it saves you from paying the Kickstarter fees (this one is free, and Kickstarter charges up to 10%).
SelfStarter was created by the Lockitron team to run their own crowdfunding campaign because Kickstarter didn't allow them to run their campaign on Kickstarter.
Eventually, I still see Kickstarter as the main/most important crowdfunding platform. Like many closed platform versus opened platform plays, it seems like most of the closed platforms win eventually.
I might be wrong on this but I would like to see example on the opposite case.