I have used both singer and mechman in the same power range. 250 6phase singer and a 240 mechman. While the mechman is a stout alt i have my doubts as to it clamping 240. As for the singer i clamped it at 276 amps when i ran out of stuff to turn on to draw more current. Mechmans customer service blows. I had a issue with my alt not charging at 14.8 like my stock alt as well as all my dash lights are now on. Matt took two weeks to answer back only to tell me 14.0-13.8 was normal for hondas (bullshit stock charges at 14.8) my eld no longer works which is my fault according to matt and the lights are my fault as well. Mike singer is awesome when it comes to his customer service. My money will go to mike in the future. I vote singer.