I use a lot of indigo! I grow some but not enough to sustain my dyeing explorations, plus processing my own takes more time.  I use natural indigo with multiple dips for silk scarves and clothing.  However, when I’m dyeing yardage for quilts I use pre-reduced indigo in bundles of three to five yards.  I only use cellulose fibers for quilts.  Pre-reduced indigo from all three sources seem the same.  I used Indigo Kits twice and wasn’t impressed and over dyed my results.  The finest ground natural indigo powder that I’ve used is sold at Maiwa.  I see color differences between natural and synthetic indigo.  However, may people don’t, they just see blue!  Home grown natural indigo keeps with the traditions passed down and practiced by women in my family, and I will always honor and respect the process.