Got my 120GB OWC SSD, Data Doubler and 16Gb ram last night. Put it all in, moving my HDD to the optibay and SSD into the main bay. Was going to clone the drives over but then just went and did a fresh ML install on the SSD which took 9 minutes
I wanted to keep my old HDD bootable in case I need to remove the SSD for warranty etc, so I moved all my docs/photos/music to a folder in the root of the HHD and then used symbolic links to recreate the Music/Movies/Pictures/Documents folders on my SSD. As I had the same username I also didn't have to change any permissions which is a result. I wanted them out of the HDD Users folder just in case it screwed anything up accesing another users folder from another os install.
Only snag I hit was when I opened the app store to download iPhoto etc it said it was already installed, and turns out the app store scans all mounted drives for apps and as it could see my HDD it wouldn't let me install. So all I did was eject the HDD from Finder, open the app store and boom I could download the apps. Once finished I just mounted the drive and away it went. iPhoto/iTunes/iMovie all worked perfectly with the alias, no changes needed. I copied my mail over to the SSD but it didn't work for some reason so I'll just let it redownload as its IMAP, no biggy.
All in all though, from taking the case of to having a new install with all my apps/data working took just under an hour. Pretty chuffed with that!
Now time to move the VMs back