Generally a large "3rd generation" APV user, I got a bit tired of carrying around lightsaber or Motorola StarTac sized mods. Today I dusted off the old 510s, filled up a couple of blank carts, and, wriggled a drip tip off of my Kraken. I must say, that it is doing the job, and then some. So if anyone asks you if anybody "still uses 510s"? Point then in my direction.