Add block doesn't work for most adds, in addition UC's own adds are too frequent and annoying. The video player doesn't allow changing quality even if other quality options are present in original video. The download speed swings vack to 1-200 Kbps from 1-2 Mbps which is strange. Stores too much cache (several GBs), which of course is all useless data. . Used to be a decent app; now turned into a dissapointment. Its been a long journey but now its time to press the big button 'Uninstall'.