Brilliant app. I use it all the time on Freetime box. It works better than the built in one on my smart tv. The tv one occasionally freezes or buffers, but the Humax Freetime one I have found faultless with no issues.
I have just (for the first time) used YouTube on my 4000T and found that, despite being almost identical in appearance to the app on my LG TV, it responds/loads videos far far slower.