Joomla 3.5 and PHP 7 are now both considered stable and have many benefits over older versions. The biggest benefit must be speed, a lot of web developers report that the combination of Joomla 3.5 and PHP 7 improves speed, the website and administrator loading times are improved significantly. 

The new versions of cciDEAL, ccNewsletter and ccInvoices should now run smoothly on Joomla 3.5 and PHP 7. I started testing the extensions on the new versions of Joomla 3.5 and PHP 7 some time ago, but there are always bugs that go unnoticed. These should be fixed now. 

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So, it is really worth looking into the update to the new versions of Joomla and PHP. You probably know that faster websites score better in the Google Search Results, so this is a serious improvement. 

Joomla 3.5 information

Joomla 3.5 also has support for "Drag and Drop Images" in the eitor, making it easier to add media and photo's to Joomla articles. There are more improvements, read about them at the above link to the release notes