I have checked the Vespa .5 and 1 HP models. Looks ok to me except that I don't know if the air pressure is strong enough and if the compressor can maintain it constant (for how long) for jobs like blow drying a car engine after an engine wash.
Can you please give more feedback on your Vespa unit. Do you need to drain out the air when the unit is not in use. I probably would use this only during the weekends.