I have the big tank but a tiny sink plus I wanted to have a portable one. Like the big one, it works great, lots of attachments, etc. You do need to know (at least for me) I have to fill the tank 2 times to do my whole mouth. Other than that my only complaint so far is there are so many ridges inside the tank so that when you take it off to drain the water it takes a few to get it all out and I’m freaked about making sure all the water gets out. Wish is was engineered where all the water would slope out.
I like the fact that it holds a charge for several uses. Seems to work well. Ordered other tips that I needed. Received them quick. It's messy for me hopefully I will figure out a way not to get wet. The water goes to quick so I have to fill it up several times for one use. I don't like that I need to hold it totally upright to work properly. But the overall performance is great. I love to put a oral rinse in it for a quick extra protection fighting plaque and ending with fresh breath.