I recently purchased 2 pulse duals.
On both there were loose parts I the battery compartments, they seemed to be plastic stickers that cover pieces of the compartment.
On the red one i purchased, the fire button has got stuck in the fire position 2 times. Both times i repeatedly kept clicking the fire button to get iut to disengage.
The filler bottle seems easy enough to fill, but sometimes the juice confess or of the ghose as I'm screwing it in. Doesn't seem to be a way around that though.