Everyone has to own one oil-less compressor in their life to appreciate its advantages over the oil lubricated compressor.
Among the many advantages of the oil-less compressor -
Their initial cost is less than that of a comparable oil lubricated compressor.
They require absolutely no maintenance, where the oil-lubricated requires a check of the oil level twice a year for most owners.
There is no way that any oil can get into the airstream so you will not have to use an oil separator of finishes that are sensitive to oil.
After that, you will find that the oil-less compressor is the best possible advertisement for an oil-lubricated compressor.
They are loud, much louder than an oil lubricated compressor; and the bigger they are the louder they are. Unless you have owned one of them, there is no way you will believe how loud one of them can be. Plan on wearing ear-muffs if you have to share a room with anything larger than a pancake or hot-dog sized oil-free compressor.
They wear out quickly. Depending on how much it is used, their life expentency is measured in months to a small number of years, while the oil lubricated compressor will last for decades with proper care. That 1000 hours that the saleman touts comes a lot faster than you would think.
The repair kits are inexpensive. But, a word of advice if you chose to buy an oil-less compressor - Buy the repair kit when you buy the compressor because they will be discontinued and no longer available when you need it.