I have the 750 Unlimited package and it's basically what they say it is. Mine dyno'd a bit lower than what they say on their website, but my A/F was in the high 11-12:1 range, so there is a good amount of room for improvement on my part. I'm still fine tuning it with a VEC2. My car doesn't have the underdrive pulleys, either so I don't know what how much power those leave out, (10-12 maybe?). Mine dyno'd just under 600 rwhp on a pretty conservative dyno here in Phx.
I think that the 1/4 mile times they list on each package are for their location, more than likely at Houston Raceway Park. HRP is a great track with much better racing conditions/ DA than where I am in the Phoenix area. Our DA here is in the 3500-4500 ft range, usually, (yuck!). I think that once my car is done with the fine tuning it will trap in the upper 130's here with some good DA. Which is fine because there isn't much I can do about the weather!