I had a Bright Ass tailight on my 07 ultra and now 2 on the 2011 Triglide. One was great, but 2 really light up the rear end. I put 3 flashes and then full stop (you can change the flash pattern with a magnet) It catches lots of attention and probably the best money I've spent for rear visibility. $200 list for each. I have also bought the HD LED rear tour pak light and have sent the frame off for chroming. They should compliment each other.
My dealer said those lights also carry a 5? yr warrenty. That's a good thing. One dealer also mentioned the same thing about, the HD light just mentioned, some people needing to install a load equalizer. That was one reason for the upgrade for the trikes. As Trent said, if you are happy with what you have, that's all that matters.