I had the 16 and the 16+ over the past decade. They are both fantastic units as long as you are within 20 feet of your pedalboard (usually not an issue for most players). That said, I mix from out front with a tablet and both units were cutting out at about 25 feet. I ended up going with a Sennheiser unit in the 500 Mhz range. I can go easily 100 - 150 feet with no issues on the Sennheiser, but it takes up a LOT of board space and doesn't have the built in tuner. I'll go back to my 16+ as soon as I no longer work sound for this band.
If they made a 16++ in the 500 mhz range I would be all over it.
I regularly step out in that same 100-150' range with my old GLXD when I'm running sound from stage, and I have had no issues with dropouts. I'd suspect it's very venue/environment dependent.
I've just started researching wireless, and I've heard more than one person say the range is rather less when the receiver is on the floor. No experience myself, just tossing in a note.