This came up on my news feed this morning. The possibility to add on to any helmet is intriguing. I'm not convinced a rear facing camera would be as steady as the promo video shows. Bulky looking. Still in pre-production. They are taking orders though.
I crowd-funded a bicycle seat-post once. I got the product a year-and-a-half after I paid for it. I really like the product and it does exactly what I wanted it to do...but I think I saved $10 by ordering early and taking the risk. I don't think I'll do that again. The link is below.