No such thing as too far, Jim... I have the Tfv4. I already have to watch where in the house that I take a rip from it, because it can set off the smoke alarms. Maybe with the R3, I can get relegated to " outside only" with that tank. I'm already there with a few of my drippers... Lol
the newest smok coil heads are really cool, and i learned that smok Micro TFV4 is really nice, and its 2.5ml capacity can be extended to 3.5ml. i got the information from a blog.