The answer to that question is in our FAQ, which was sent to you when you signed up. It's titled "Welcome to Head-Case". It's also linked to in my signature here.
gallery and iweb are the main things I was worried about. Looks like those don't go away until next summer tho.
You also lose keychain sync, and a few other things, but keychain sync has been a pain in my ass lately. I might go ahead and switch over soon.
As a homeowner, you can get away with a commercial mower that's pretty old, because it won't have the duty cycle for you it had commercially. I've seen quite a few for less than the price of most riders on craigslist.