I think it will be better if they will offer a 30 days trial for their users or maybe a limited amount of storage they can use. That way users can actually experience BTR.
Giving the users a free trial is actually a good idea, it will give the users the experience or a taste of what boosteroid is all about, maybe a few days trial is enough, just enough to entice the users and let them experience the real thing.
1 week free trial maybe at the beginning of ICO. This will test Boosteroid's cloud storage system if there's any bug or something issues that they wanna fixed. This will help to show that Boosteroid is worth to invest, not just pure hype.