I had 2 Voyages and bought 2 more refurb Voyages after using my sister's PW4 for an hour. You like what you like. I'm a firm believer in supplemental devices, but as JSWolf says, you need to occasionally use all of them or the battery will go bad from not being charged. I can't use the inverted mode, so not a game changer for me. Note: I have no personal experience with an Oasis, so not included in my comments.
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