Regarding the Omron Mesh Nebulizer NE-U100....I actually own two ! It is an extremely helpful, portable, and quiet nebulizer that I do recommend. It does use AA batteries but can also be used with an AC adapter. It works very well if you follow the instructions. It can be used with hypertonic saline with no problem. When you fill with nebulizing solution you need to tip it toward you in order for the mesh to be activated. Once it is, however, you may hold and tip the nebulizer in any comfortable direction. I take two with me when I travel as it is helpful to have an extra one if for example one's components are being washed or are drying. Also, just in case of anything. Much easier than carrying a compressor.
I do use the Ombra Compressor along with the Aerobika system at home for air clearing on a daily basis.