"The accessory market has responded to Apple's challenge of getting an entire day's use out of the iPhone 3G with a range of external batteries. Some function as "dongles" that attach to the bottom, while others are built into protective cases that, upon first glance, look as though their designers were drawing blueprints while under the influence. Incase's Power Slider is neither of these things." - Devon Campbell from Bookmarklet

sexy! Best one yet, props to the team who came up with this :-) - vijay

Looks stunning. This would make a nice case, let alone that it's a battery back up as well. Nice! - Fox Tucker

$99 they say but it adds .4 inches to the width. - Amani

Looks great! Am I just seeing things or is that a standard USB B port at the bottom as well? Useful for just charging with more available cables and other secondary charging sources. Amazing if it enables syncing via that port as well! - Jamie Dool

@Jamie I believe the port either charges the battery or syncs. There is a button on the case that you hold for a few seconds. After that, the data is passed through. - Devon Campbell

I held it today at the Apple store in SF. It's extremely light and has a good fit and finish but it does add a noticeable thickness to the phone that I'm not sure I want in my standard front pocket carrying location. - Jamie Dool

Just bought it and LOVE it. Don't mind the thickness. Much better than carrying around a dead brick! - Ryan Brack

I could NOT use my iPhone without this; otherwise, with all of my "pushing" and surfing and music-ing, my phone did not last past 5PM, and that is no exaggeration. Thus, when I saw this and some positive reviews, it was a no-brainer. Now, I run my phone in the same way I did before but with the brightness cranked to the top, the wireless on at all times and at 5PM I'm usually still at 100% battery. Fantastic product (although I did see some pictures of new, thinner ones out or coming out...)! - Brandon Blattner

I wonder when the new thin ones will come out. I just got a case today but I would spring for the newer thin ones. Any idea? - Amani

Just picked up one of these today as a result of needing to go to the genius bar for something else... can't wait for it to finish charging!!! - JR

Tested the device on the 3GS and it works fine. Actually it will work on all three generations. Prior to OS 3.0, I used to get a message on the 2G when connected 'not made for this device' or something, but haven't seen it again since upgrading to 3.0. However it doesn't really fit the 2G design, as it is really made for the 3G/3GS forma factor, but it will work in a pinch! - JR