USA Limos: Jericho Turnpike

Is anyone using USA Limos on Jericho Turnpike. We are interedted in the Porsche (14 passenger)
We spoke with Toni today and she quoted us $350 for 2 hr min. Does that sound about right??

Also there is a reccommended 20% gratutuity charge for the driver. they also throw in a balloon launch for free.

Thanks,