What loss of value would this link experience?

[Webfor]

What loss of value would this link experience?

If the link is actually a link to the from site that is 301'd to your site like this example below:

i.e., www.domain.com/29834?=www.yourdomain.com

My thought is that simply because you're going through a redirect  (In this case a 301) you will lose slight value there. But I'd love to hear your thoughts and reasoning on any other affects if any (direct or indirect) you think it may have.

[ASOS]

Yes, a 301 will lost some link juice, around 80% is thought to be passed through, give or take a little and depending on who you believe.

Hope that helps.