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The Emglo/DeWalt/Jenny pump is just a very well built pump, with disc valves and built-in head unloaders. You can get some with pressure lubrication as well. All cast-iron construction (heavy to carry though). With the unloaders built into the head, you have a quieter running machine. The Rol-Air will have to have some sort of exhaust dump valve to bleed air off to atmosphere when not pumping, since there is no mechanism to hold the intake valves open when running unloaded. Both systems work fine, but I think the Emglo/DeWalt/Jenny system is a superior design. There may be some lower-end units without these head unloaders though, so look to see if there is a 1/4" copper line going into the side of the head, that's the giveaway. I don't understand how they can sell the same pump under the DeWalt and Jenny names, unless one is licensing the design from the other. Either way, if it's the same as the original Emglo unit, it is a very well built pump. I'd take disc valves over reed valves if the prices aren't too far apart. If the Rol-Air is significantly cheaper, I wouldn't feel bad about going that route, if it has a motor you can trust. The only drawback to the Emglo pump was the fact that they used a roll pin for a key on the input shaft flywheel, which was pure hell to remove when servicing the unit. Keep all portable compressors nice and level when using them too, or you may starve a con-rod bearing of oil.
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