I've found that an amp allows the NCS to usually copy me on the ERIN net. Otherwise, I'm down in the noise level. I'm typically running 400-600 watts. Working DX contests, I've found that firing up the amp usually results in a contact on the first call, without it, I've called for 30-40 minutes and not made contact. So, there are times when it's a great tool. It's better to have it and not need it, than need it and not have it.