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All I can say is it's well worth it. If you have trouble downloading files into the romulator due to not enough battery power, either plug in your laptop or turn on the ignition (but don't start), then download.
It sure beats the hassle of installing/removing eproms. You'll be glad you made the purchase. If you don't like your tune, pull over, disconnect the laptop from your ALDL port, hook up to Romulator, download new file and your down the road.