Online upgrade of 2008 R2 Standard to Enterprise

[beany1]

Just wondered if any one has any experience of an online upgrade of server 2008 R2 standard to Enterprise?

I've read a few blogs using the command dism?

Apparently: dism /online /set-edition:ServerEnterprise /productkey then the product key

I've also read you can't do it if its a DC...

So has anyone done this, especially if was a DC?
Did it work by demoting the DC and they using dism then dcpromo, or am I better off just flattening the server and installing Enterprise? Is there alternatives?
Also would this work if I purchased Enterprise and used the product key in dism?

Cheers!

[sted]

Not quite the same but ive used dism to alter win7 home to pro but only as an offline image it worked but not 1st time.

Tbh id not even want to try it on a server. Only reason i did it on win7 was %*&#ing fizzbooks and hard to find drivers

[beany1]

Cheers for that Sted, that was how I was feeling. Think ill go down the rebuild route then! Unless anyone has any other views / different options.