I have used a Lemo before, never with the drop. I currently use a Billow though, if I am not using one of my RDAs. I have a nano kit for it, which is the Billow equivalent to the Lemo Drop. Full size, either is pretty big, especially if you are used to RDAs. These devices (with drip tips) are about the length of a whole SMPL mod. The drop/nano makes it a more normal size device that slims down your setup. You do lose juice capacity, but I take a bottle with me anyway if I am taking it to work.
As for the flavor production, it may be slightly improved, but it is not a significant change. It depends more on your size preference and how often you want to fill the tank.