Hi,
First, g_unlagged 100 don't recover from a ping 100 displaying at client side. It is a pretty hard to make a real association between g_unlagged ms and ping displayed.
After many test, I see a g_unlagged 200 give a unlagged fully on for all players with a ping < 100, and a ping reduction for others.
As Jal and Kagounator said, if you have a bad ping like 300 with a unlagged 100, you will have a ping improvement, and you will probably play like a ping arround of 230.
We use this unlagged patch for about 6 months ago with a 200 value on {tHc}Public server, and it is pretty good : always unlagged on effect for players with a good or medium ping, and disapearing of strange effects given by unlagged fully on (mass driver shot behind a wall, goon chomp from 3km of I, ...), but without fully remove unlagged for bad ping, and give them a really better game than with unlagged off.