Yes. The pumps are effective if used correctly. As soon as the session is completed the extremity should be compressed in a garment or a bandage. This should be continued on a daily basis.
Yes, but ... As dr. Salartash said, they are effective but they have to be used correctly, used consistently, and they take time to use properly. It is important to remember that they are only a part of a decongestion treatment regimine, though, that should include compression stockings, lymphedema massage, diet, and exercise.