Apple's wonderphone will fly off the shelves at the end of this June. But whether you are a music lover, a business e-mail addict, a mobile power-user or just a normal consumer, there are several good reasons to think twice about dropping $500 for the first-generation iPhone:

The iPhone's battery is one example of a feature that could flop. By all indications--Apple is still being mum about almost all details regarding the device--the iPhone's rechargeable battery is sealed inside its case. That's what Apple does already with its iPod devices, presumably to save space. The company says the battery will last up to five hours of talking, watching video and browsing the Internet. But it's not clear how those claims will measure up in the real world. What happens if you use the phone's wi-fi connection heavily? Or a Bluetooth earpiece? Without a midday charging pit stop, iPhone owners may have to consistently choose between using its Web and multimedia features or saving battery power for phone calls.

The iPhone's stripped-down data features could also provide incentive to wait for a better offer. Apple's boilerplate is that the iPhone is a "revolutionary" device for browsing the Internet on the go. To an extent, it has a point: Apple's Safari is arguably the most powerful mobile Web browser. And the iPhone's large display will surely make surfing the Web more enjoyable and functional than on a tiny Motorola Razr screen. But for whatever reason, Apple decided not to allow the iPhone to work on AT&T's fastest, "third-generation" (or 3G) wireless network, opting instead for its slower "EDGE" network. The difference is apparent even on a small-screen device browsing scaled-down, mobile-edition Web sites. When you're surfing full-size Web pages, as Apple touts on the iPhone, the slow speeds could be a deal breaker.