Transfer Hard Drive from 20" iMac to 27" iMac - Good or bad idea?

I've just bought my wife a new 27" iMac to replace her 20" iMac. To keep things simple I'd rather just take out the drive in the 20 and put it in the 27. Anyone try this and is there any reason why it wouldn't work since the OS is "universal" for these recent machines?
The reason I don't want to just run with a fresh install (which is what I would prefer to do) is that it's my wifes computer and then she'd have to start new with all her settings etc. While I think the migration asst is a great feature, i've also had other issues doing that that leaves a bit of a mess behind it and some permissions got screwy once.
I may just give it a go and see if it works right away. I'd prefer not to spend lots of time "transferring" files, data, prefs between the old/new machines and just get up and running quickly since her 20" OS install is working great.
Thoughts?

LawrenceT,
Welcome to Apple Discussions.
*Very bad idea if you intend to use the OS that is on the 20" machine in the 27" machine for a number of reasons*. First you will void your 27" machines warranty and if the 20" has any left it's gone too. Next is you will run into problems with the 27" because the 20's OS is set up for that machine which has totally different specifications. What is wiser is to use Migration Assistant and simply move everything over, this is done when you intially turn on the new machine it will prompt you. If you have already set up the 27" then you can still run Migration Assistant. Just open the application and it will walk you through the process. If you have trouble finding MA simply open Spotlight (upper right corner icon that looks like a spyglass) and type in Migration Assistant.
Regards,
Roger

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