Greater Vision Totem was at least 3 times as good as the current Warding totem
[math]
At Level 18, the current trinket is able to sustain one ward permanently, while with the old one you could have 3 wards on the map continuously. On the other hand, if we look at Level 9, the current trinket has a ward up 58.14% of the time, opposed to the old which had 3 wards from Level 9, which means it was 5,16 times as efficient at that Level.
[math]
In short: Give us the old trinket upgrades back [zombie-nunu-tears]