Switching subdomains

[WDN]

A few years ago our company decided to merge all its websites (magazine brands) as sub-domains under one new root domain. So the current situation is like this:

brand1.rootdomain.com
brand2.rootdomain.com
brand3.rootdomain.com
...

For the moment the rootdomain has a domain authority of 66.

In a few weeks we would like to switch that rootdomain to the strongest (highest trust, pagerank,...) brand.

So we get this:

www.brand1.com
brand2.brand1.com
brand3.brand1.com

Before we make the switch i'll have to make a pro and con list.

So I hope I can get some advice for you guys if this is a good idea or not.

[craven22]

Since your 301 redirect are years apart it shouldn't cause that much of a problem. I wouldn't make a habit out of it though!