I have and use all the systems in the US market. I use them on all indoor window cleaning jobs. I like the Stingray with deep cleaning pad best but for windows above 2 floors I like the Cleano better. The poles are stronger. We use the bronze wool 6by9 pad on all windows that have a heavy film first then use the green pad or gray pad and even the white and green pad. To answer your other questions I and posting a link to both of these products.
https://windowcleaner.com/unger-stingray-indoor-quickstart-cleaning-kit-5-foot
Like any tool there is a learning curve but I have been working with it since day one when it hit the market with the Unger Speed Clean Kit