Metal Roofing with collated fasteners: Is it worth it?

Is it worth having a metal roofing gun that utilizes collated fasteners? After using it for a job or two, I can immediately say yes...if you can find the fasteners for a reasonable price. When installing screws in a metal roof either DIY or for a profession, the worst part is bending over all the time, trying to juggle a handful of screws, and inevitably dropping the screws. Collated fasteners and Simpson Quik Drive are definitely the answer, but at the cost of about three time the screw cost. If I can find a source for screws that are economically reasonably for the time saved and effort it takes to install, I will definitely be using this more often.

The Quik Drive installs the screw with consistent depth every-time. Yes, I have had a couple issues here and there, but overall what tool doesn't have an issue.

amazon link where I bought it
Quik Drive BGP 300: https://goo.gl/6eTepf
Makita XSF05 Screwgun: https://goo.gl/EaQejH
Adapter: https://goo.gl/NmH6B7