Yes, I bought the +4, put it on and the good news is; my better-back-seater-half noticed much less wind in her face, the bad news is; it's too short, I'm one of the few who likes to look thru the windshield so I put my extra-tall back on and will sell the adjustable.
I would recommend the adjustable if your trying to cut down the back seater's wind and noise.
I've got the new adjustable OEM height with a vent and like it for the most part. My wife says it really cuts down on the buffeting when it's raised some, I guess because it's wider than the OEM. However, when she's comfortable I've got the top of the shield in my line of sight. I never thought a vent could make that much difference either, it's great.
I'm 6 ft 3 with a long torso, just installed the plus 4, it works perfect for me. I'm looking thru the shield a couple of inches from the top, i can tilt my head back a bit and look over the shield, very little buffetting, to little to notice. I'm happpy with this shield, finally got one that fits.
There should be no problem with the GPS mount on the dash, in fact the vent location is slighly higher than the OEM and this windshield does not lean back like the Original Tulsa does.