Forwarding Multiple Established Websites

Hello,

I have a couple different and well ranked websites offering different products. I have recently decided to combine all of these products onto 1 website vs creating a new website each time we release a new product. Should I do a change of address in webmaster tools and 301 the domains to our new all in one website? If so, will this hurt or help SEO? Again we are well ranked for our keywords on each website however want everyone to eventually merge to one website. Your suggestions are greatly appreciated.

According to Moz & Google, 301 redirecting will pass 98% of the link juice. As for redirecting multiple domains to a single site, I don't think there would be much of an issue, but I'd be sure to implement canonicalization just to make sure.
I've 301 redirected multiple domains which each have millions of backlinks to a single one of my domains, but given the nature of the site, I'm not really going for SEO.