I have the Dualsonic Professional unit as I wanted to buy the one that went to level 5 in intensity. This unit is very strong for one that can be purchased for at home (or professional use) and is very sleek and beautiful. I also tested it on a piece of acrylic and it delivered 20 dots per shot/area for the face cartridge (as advertised), which is normally1 dot for many other at home HIFU devices. Also the only one that I know of that has dual layer technology.The eye cartridge is great for treating areas that you can't get to with the face attachment.The instructions are very clear and couldn't be better, actually. It will take time to see results, but I have been using it every two weeks for two months so far and feel there are already some very positive changes in firmness and lifting of my skin. Yulia, their brand rep is very helpful and communicative through the entire process of purchase and with any questions regarding the unit itself. The conductive gel isn't my favorite, as it seems to be pretty heavily fragranced, but it works great nonetheless. I plan on using this on my mom too!