I have nothing but bad things to say about the GPL5. I owned one when it was a yellow RoboToolz, before it was rebranded in gray as Porter Cable, before it turned blue and became Bosch. Unlike the magnetically damped pendulum mechanisms used in just about every other self-leveling laser on the market, this POS relied on a motor to kick the laser into level. Except it moved in increments that meant that if you disturbed the laser and put it back in the same place, the plumb points would shift every time just a little. I NEVER had any faith in this, as the plumb points weren't repeatable enough to even set a door jamb.
Bluetooth isn't a significant battery drain (it consumes less power than simply sitting on the shelf), and lets you use your phone instead of a separate remote. A remote can turn planes on or off without disturbing the laser by touching buttons, or maybe you want to attach your laser near the ceiling and control it without getting on a ladder.