It's just like Rockin' Rio. I actually sprayed Rio on one arm and Luxe on the other and I can't distinguish them. The only difference, and it is minor, is that Live Luxe's dry down is a tad (just a tad) more chemically than Rockin' Rio's.
A confirmation letter is a correspondence sent to confirm details, like oral agreements, appointments, and job interviews. The letter can also confirm a reservation, a response to an invitation, receipt of a various items or services, or travel arrangements.
Certified mail is a USPS service that allows you to confirm delivery. The Postal Service keeps certified mail proof of delivery records for two years. When you send certified mail, you get a receipt that can be useful if you are mailing a legal, financial or other document that must meet a deadline.