I spent my teenage years with relatives in Harrison, NY for a total of about 5 years. Frankly, I was happy to get out and I've never really thought to go back. Somehow I was fried by the blatant show of materialism everywhere: perfectly manicured lawns, huge swimming pools, one tennis court after another. I found the lack of diversity boring.
Harrison is a good place for enjoying a privileged lifestyle. It's posh and showy. Many of it's residents are wall street types. It's not a far commute from Manhattan (22 miles) so professionals also choose to live here for that convienent fact.
Real estate costs can only be met by multi-millionaires. It is not a place for the average American citizen to reside in. You have to be rich to live there.
This area provides ample and diverse access to shopping, restaurants, recreation, entertainment, and the public transportation is great.
The downtown area is quaint and good looking. Harrison has an excellent town recreation department with parks and playing fields for residents. If you can afford to live there, it's safe, beautiful, and it has nice schools.