There are probably now about 6 needle RF devices on the market, with the leader still Infini. Most don't have insulated needles and those should not be considered. Vivace has insulated needles. One of its deficiencies is its motor driver, which is very slow. Although wattage is high, the actual joules into the skin is low. This means that each treatment is less effective and more are needed. On Vivace literature/videos, it is stated that 3-6 treatments are needed. Infini has been doing its research and now supplies significantly higher energy into the skin to make each treatment even more effective. There is slightly more redness, lasting up to 4 or 5 days, but the results are better. These recent changes (Gen 1.2) consist of a new needle tip that gives a more even distribution of the energy. New settings which give higher joules per pulse. And a new user interface that makes treatment parameters easier to choose what's best for patients.