Will you lose out if you back a venture on Kickstarter?

After complaints about a project called Zen Blanket, we look at the pros and cons of crowdfunding

It is described as a hi-tech blanket that will give you "the best sleep ever" and reduce your stress levels, though at about 195 ($249) a pop it is certainly not cheap. The Zen Blanket was promoted on the crowdfunding websites Kickstarter and Indiegogo, prompting thousands of people to sink money into the venture - but some are now crying foul, demanding their money back and discussing class action lawsuits.

One of those who is definitely not feeling zen is Don Dennis from Scotland. He pledged 118 to the project, in return for which he would be sent one of the blankets (195 is the usual price, but early-bird backers received a discount).