We tested the Surge way more than 20 times with max 1k chaos used. In our opinion, we think that the outcome (T4 thralls, especially workers) is by far too low for the huge grind you have to do to actually get towards the 1k chaos. Especially on heavy pvp servers starting the surge makes you a big target on the map. For that risk the outcome is way to low. We had multiple surges with not a single t4 in it. Things like Alchemists and Smelters in Rank III have been ultra rare as well.
Also the fact that the wild surges, atleast from what we have seen, dont even spawn T2 Worker Thralls. This feature in itself is useless cause nobody will grind them for having a chance on getting t1. We think those wild surges should be a start for new players to get at least some useful thralls.
Our surgestion would be to give the Wild Surges a chance to spawn up to T3 (in rare cases) but T2 frequently so that especially new players dont have to go into the grind to summon a normal surge that will actually give them T2. Also the biggest surge should have a way better spawnrate of atleast T3 Thralls. Its not a great mechanic if you have to farm for hours to start a surge that might not even give you a single usefull T3 Thrall.