Happy to report a 15' length is working great with vixen. (100ct 1804 square rear entry nodes) Ramps well, takes programming, no flickering, nada... That is almost 300% longer than what I recall being posted as acceptable previously (6'). Works well with LSP too. That said, I am getting a pretty serious multicolor flicker with string white/all with rgb cycle in xlights. Not sure what the difference could be.