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People like metal for reliability purposes. Obviously metal can withstand more abuse than plastic.
Now, I only have an ABS slide and it's been holding up quite well with propane. Eventually I'm going to get a metal slide, but I'm confident my ABS slide will work out for at least the remainder of the year, assuming I don't abuse the gun.
Speaking on a theoretical level, it would seem to me that you would get a marginal FPS boost with a metal slide, because of the added weight of the metal slide. The gas will escape from the path of least resistance, and that would be out the barrel pushing the BB. A portion will work to push the slide back. With the added weight of a metal slide, there would be more resistance on that path, encouraging the gas to work pushing the BB out the barrel rather than moving the slide back.
When I inevitably get a metal slide, if my ABS one is still working I'm going to chrono them both and see if there is a noticable difference. It will be negligible, if any, but the gas won't "work harder" to push the slide back, more will just be encouraged to go out the barrel instead of pushing the slide back.
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