I keep reading that Sofwave is intended for lifting the eyebrows, neck, and chin, but my derm is recommending it for tightening the lower face. Is Sofwave any more effective for facial tightening than any of the other, less expensive devices (Opus plasma, Deka SmartXide Dot, etc)? If the tightening effect is only due to collagen production, is there really a benefit to using Sofwave over other treatments on the lower face?