I have seen some like these but the Solo had a few advantages over them that I thought warranted the extra money. The first was being able to point the nozzle up and down. This makes it possible for me to basically shoot around corners so now I can easily water the plants in my gtp cage by pointing the nozzle down and spraying over the perches. My last spray bottle had to be tilted to get in there and the hose would very often be out of the water so it wouldn't spray, and trying to water them with a cup is difficult because the perches get in the way.
I can also flip the nozzle up and now I hardly have to open my racks tubs to mist them. Im able to stick the nozzle itself in the tub and spray the entire tub without disturbing the snakes like I did before. If I was trying to use my old bottle this was not possible and the tub had to be fully open to reach the substrate in the back to get a full misting.
This sprayer also has a thick skeletonized push rod for the pump. It is much stronger than the other styles I have seen and should last me a long time. I don't see this one bending under stress when you build the pressure which I have seen the thin rods do. Its also a oiled pump arm so it pumps easily and comfortably with little effort.
This unit really impressed me over the competition and after giving it a few weeks test drive I wanted to share it here to help others who dislike the regular spray bottles like I do if they were looking for a replacement. I held off way to long from buying one.