It takes too much time to react to sound going below the threshold. What am I talking about? I hit a power chord, then rapidly mute everything with both my hands, and then after half a second this noise gate starts suppressing the noise. But the threshold was set as low as possible and the decay was set to "min"!!! So, in this case, the noise gate wasn't really doing much. This is pointless.
If you're OK with this noise gate having a very slow reaction, you shouldn't have any problems. However, if you want a noise gate to engage almost instantly, don't waste your money on this one and invest in something better. I guess, there can't be cheap and at the same time decent noise gates.