Seems interesting, but we all know there's no free lunch. This is definitely a case where you'd want to read all the fine print. Of especial interest would be the fees they're taking out on your investment portfolio. I'm guessing this falls into the category of suboptimal, but an interesting forced savings plan for those who are disinclined to save.
It would be interesting to compare the practical differences between person 1 who gets an Aspire loan, and person 2 who gets an interest only loan, and invests the difference in the market himself.