Is this for your daily driven vehicle, or competition? If for competition go for it.
If it's your daily vehicle I would make sure you're getting 100+ idling amps, and ask what diameter pulley it has, (particularly factory vs overdrive) because those things are important for daily use.
I owned "380" amp alts that bench tested 280 peak and 10 idle. Obviously I had to rev my truck at stop signs to keep my battery from dying.