I use SliceTube quit a lot, infact i have the premium account. howewer it has some difect like: i can't see my status of the premium account, and in fact if I want to unsubrscibe I just can't, the tool has some issue with the end of the video: it doesn't want to download the last seconds and you lost something like the last 4 seconds of a song. And finally there isn't a "contact us" for some support.
It work, but it has some issue and it would be nice to see some support instead of nothing.