I completely agree with you! I was actually going to buy the v3 white amber switch backs a few days ago and I emailed them asking if the resistor was built in and they said their new 2.5 gen needs an external resistor. That makes the install slightly less clean. But you also have to remember that many people change their flasher relay to a led compatible one. So their is no need for a resistor in the control box.That's kind of crappy VLEDS got rid of the built in resistor that came on the V3's for forever. No way in hell I would buy them over their Platinum line now, unless I wanted the switchback feature you have. All my V3's had the built in resistor, sucks they got rid of it. IMO, for that price of the V3's, they should come with the built in resistor.