Beyond the Optimizely QA tool, what do you use to QA/validate campaigns?

[#1]

What other tools are others using to QA or validate campaigns/tests? 

We've used a "test cookie" approach in the past which works well for complex flows, but have issues when it comes to specific targeting for geolocation or devices/technology. 

Curious what others are using!

Thanks!

[#2]

We mainly use the Test Cookie route. In regards geolocation and device, you can use Hola/HMA and Chrome's device toggle feature. Another way would be to include a custom querystring instead of cookie to share the QA preview to non tech people.