How Do You Gather Customer Feedback On Your Field Techs?

When your techs finish a job, how do you find out how well things went?

It seems like many service companies use an automated phone surveys, but I personally almost never complete those.

Sometimes, the company sends a webform survey, and I usually finish those:

I like this because I can think about my answers better, but also I like to think the company receiving it can study responses better.

What do you use? Please explain the method your use. Does it work well?

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