It says from $0.00 a month - but Shopify have slapped me with a $49.00 monthly charge - What the....!!

Definitely not recommended. The free version allows only 500 visitors to see the badge before it hides. This is incredibly low. You don't even see the benefits of the pro version with only 500 hits to see if you even want to upgrade. Probably will be uninstalling.

Horrible, they are emailing customers of mine offers saying they qualify for their anti virus. This makes my company look terribly bad. I'm about to uninstall it.

So... After removing McAfee Secure badge I've seen exactly no difference in my conversions.

My sales even increased since... A lot.
One less pop up in the page.
Less noise.

What's more...
I've removed the app from my Shopify store and they still continued to charge my credit card for all those months that I had removed the app.

So now, I'm trying to figure out how to get my money back.

I hate applications/companies that do this!!

If they are not tech savvy enough to get an automatic removal once I click remove from within Shopify, how do you expect them to be efficient enough to securing your customers and your site?