I picked up a 2.5 gallon home Brew keg used. Just fill it full of cleaning solution and hook up your lines. Repeat for rinse and toss it back in the attic until next cleaning
The pressurized one is useful because it can also be used to clean carb stones when the wetting pressure is higher than what a home-brew pump can provide. This way you can use CO2 to force cleaner through the carb stone and ensure you maintain your carb stone's efficiency and integrity. Other than that yeah its pretty useless besides saving a few minutes by not having to undo everything, however I still undo everything to clean it anyways...
Most kegerator owners use the D-system sanky kegs which require special tools or a modified coupler to access or fill for cleaning. These kits are designed for this sanky application, but If you are a homebrewer and can put cleaner directly into your keg, and you have an extra keg laying around, the cleaning kit is not needed.
I would do that b4 but u use a lot of co2 when cleaning beer lines ..I have since switched to a small submersible pump for 10 bucks on Amazon works perfect and doesn't waste co2
