I have both sizes of Glue Bots. Far easier to use than the bottles. Better control of where the glue goes and the double chamber means that when you release the pressure on the sides, the bottle sucks the glue back into the bottle. You can cut the tip a little with scissors to control how much glue passes through. Far more control than using the glue bottle, and the tip on the Blue Bots has never clogged whereas the original bottle often requires a paper towel wipe to keep it from clogging.
I use brushes for dados, but I often have very thin strips of cutoffs, which I cut into short lengths and use to spread glue over any larger surface. Faster than a brush when you have short open time and a lot of pieces to connect. Thanks stick for the brush washing tip, I have always just tossed them out.