I use Jungle Testnet as my staging chain since I launched MonsterEOS and it's been used so far with great and stable reliability of my contract, RAM usage and monsters data. Junglenet is amazing!.
Creator of MonsterEOS
The Jungle have been critical to the success and adoption of EOS. Many dApps and BPs we have today first learned EOS and developed their software into production releases because of the value Jungle provides.
The Jungle Testnet has been absolutely crucial to the launch of EOS.
John Milburn (jem)