I don't think there is any downside to owning a Libre Pro over the JBL. Both have the same software. The JBL has replaceable batteries which will cost you a lot over the rechargeable Libre Pro battery. You can use recharageable batteries in the JBL but I doubt they will last more than 10 hours of reading before needing recharging. The JBL has a dictionary lookup that the Libre Pro does not have.
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