You can't really compare a DX3 to a 4PK, they're in totally different leagues! I own a 4PK myself and it is a top notch transmitter, it has roughly the same software as your 3PK did plus some new features and more importantly a new design which is really comfortable, I've got no problems holding it for over 30mins a time....
Get a LiFe battery in the 4PK and it's even more comfortable, as well as lasting for several meetings on a charge.
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