I've heard good reviews from people using them. The customer service is great, prices are decent. I have one that I use only for comps, does well at 2k rpm. At idle it puts out 30 amps, where my stock one was putting out 60 amps at idle. But rev it up over 1500 and the power is there when you need it. You can have them built to put out more amps at idle, unfortunately I bought mine off a friend, so I didn't have the option.