iPhone 7, iPhone 7s: Is It Worth The Upgrade?

Although the new iPhones won't be released until Friday, the reviews are already pouring in.

Apple hopes the iPhone 7 will help boost sluggish smartphone sales. Last year, Apple sold a record 13 million iPhone 6 and 6s plus models in the first three days. This year, the company won't disclose figures, but T-Mobile and Sprint say the phones have already broken their first-day pre-order records.

The iPhones are water resistant, have improved battery life, and feature new cameras.

So is it worth the upgrade?

"The iPhone 7 and 7 plus are really kind of a bunch of upgrades we hoped to see in previous phones, unless you can get your phone sold for a value that basically allows you to get the new phone for free or close to it, hang on to your phone for a while," said Scott Stein, Senior Editor of CNET.com.

Both the iPhone 7 and iPhone 7s will be available in stores on Friday.