Just wondering for those who have received their iMacs with Fusion drives, are you happy with the speeds and functionality of the drive? Do any of you regret upgrading? Or perhaps regret not upgrading to the SSD? I'm interested to hear how you are all liking the options that you've selected. My SSD iMac is just getting ready now. A part of me wishes I had the nerve to install my own SSD and save myself some money or even just downgrade to a Fusion drive, but I'm pretty sure I'll be happy with my purchase. The prices are just slightly irritating.