You should be ok...... the humming was with the earlier serial numbers..... I believe they replaced the digital effects to correct it. When I sent it in, I don't know what they did but it came back with the same hum, so my buddy Greg, owner of BCR Guitar & Sound, called his sales rep who told him about the issue with the earlier serial numbers. I kinda pissed me off that they knew about the problem but didn't correct it the 1st time. Anyway.... we sent it back again and Greg called them and told them he knew about the problem and they either need to fix it or replace it. Works great now. My only disappointment is that the Line-Out is not a true Line-Out, you can't run it into a PA mixer, you CAN run it into a computer or a recording device, but if you want to run it through a PA you have to mic it.
It really like the amp, if you're still worried about getting on with a hum, get the one without the digital effects.
~SD