PC Magazine reports: "To understand the Centro, you have to understand who it's for. There's nothing here for existing Treo owners, and there's little to entice other smartphone users to switch. Rather, the Centro exists to put more power into the hands of folks who are considering devices such as the T-Mobile Sidekick ID or LG's enV—inexpensive sub-smartphones with e-mail, text messaging, and media options."
This looks like a pretty impressive little device. Read the article for a complete review.