The iPhone 5s was made available to certain media outlets during the introductory press event. Apple has since sent out review units to specific media outlets who have published more detailed reviews. Apple has also highlighted select reviews of both the 5c and the 5s on its website.

Touch ID

The early reviews have been very favorable. The new fingerprint sensor to be said to be both accurate and fast. TechCrunch wrote, "At first glance, it’s easy to dismiss the fingerprint sensor as a whiz-bang feature designed to attract eyeballs and do little else. But this isn’t that. The fingerprint sensor, unlike some other questionable recent smartphone tech like gesture control or eye-tracking, doesn’t feel like a gimmick or tech demo; it feels like a mature feature that actually enhances the overall experience of using an iPhone in a noticeable way that you encounter very frequently."

Camera

The new camera is also receiving favorable reviews with improved low-light performance, burst mode, and slow motion mode. AllThingsD wrote, "All my pictures were slightly sharper than on the iPhone 5 and low-light pictures were much less washed out by the flash. The camera app has been improved, with a new burst mode that takes many shots quickly and then picks the best ones, and a slow-motion video feature that lets you choose parts of an action sequence to slow down. It worked seamlessly."

Speed

Anandtech extensively benchmarked the new phone to show how it compares to others on the market. Meanwhile, DaringFireball performed various benchmarks to compare it with its predecessor, the iPhone 5. They found that the iPhone 5S was approximately 2x faster than the iPhone 5 on a number of CPU benchmarks.

More Reviews

- The Loop
- TechCrunch
- AllThingsD
- Engadget
- USA Today
- CNET
- NYTimes
- T3
- AnandTech
- PocketLink

The new fingerprint sensor on the iPhone 5s has been getting most of the attention behind the new release. The early hands-on impressions have been positive, and Apple has clarified how it works in practice.

During its Touch ID presentation, Apple was quick to specify that all fingerprint information is encrypted and stored "in the Secure Enclave inside the A7 chip on the iPhone 5s" rather than being stored on Apple servers or backed up to iCloud. Developers are also not being provided with access to user fingerprints as a means of authentication.

Apple also gave the The Wall Street Journal a few other tips on the fingerprint sensor, noting that it occasionally malfunctions with moist fingers or fingers scarred by accidents and surgery. The company also explained that Touch ID must be supplemented with a passcode.

Only the passcode can be used to unlock the iPhone after its been rebooted or hasn't been unlocked for 48 hours. This is reportedly to prevent hackers from trying to circumvent the fingerprint sensor itself.

On September 22, the Chaos Computer Club managed to bypass Apple's fingerprint sensor using a photograph of a fingerprint to create a model, causing concern that Touch ID could be hacked by thieves. According to security expert Marc Rogers, who also completed the fingerprint bypass, the average consumer should not be concerned as the fingerprint bypass method requires a significant time investment and over a thousand dollars worth of equipment, putting it out of the hands of the average street thief.

Apple recently released a statement indicating that a manufacturing defect was causing shortened battery life and longer charging times in some iPhone 5s units.

According to Apple, only a small number of iPhone 5s devices are experiencing issues, and the company is contacting customers with affected phones (determined by serial number) to offer replacement devices. Customers who have not been contacted by Apple but believe they have a defective unit can contact AppleCare for a serial number check.

Since the iPhone 5s was released, there have been widespread complaints about Touch ID's accuracy, which has been described as "fade" by some. The fingerprint sensor has a tendency to become less reliable over time, a problem that was rectified with Apple's iOS 7.1 update.

With the introduction of the iPhone 5c and iPhone 5s, Apple has discontinued the iPhone 5, and kept the iPhone 4S as the entry level model -- free with contract -- iPhone. Apple maintains a comparison chart showing the differences between the models.

In making a decision, much of it depends on how price sensitive a consumer you are, and how important your iPhone is to you in your day to day tasks. At this stage, it is hard for us to recommend the iPhone 4S to anyone more than a very casual and very price-sensitive customer. The 4S has the smaller 3.5" screen, and a slower processor -- it's already 2 year old technology, and will be 4 year old technology when your contract runs out.

The iPhone 5c is based on last year's technology, but with this new refresh, that technology remains far more current. The iPhone 5c also incorporates the same 4" screen as the iPhone 5s and should support all software for the foreseeable future. The $99 starting point makes it a reasonable choice if the iPhone 5s features don't call out to you.

The standout features of the iPhone 5s are the fingerprint scanner, faster speed and camera improvements. For serious smartphone users, these can be compelling features -- but for a $100 premium over the corresponding iPhone 5c model.