I use the IGO-L myself. I looked at the octopus but it doesn't have a well to hold the
juice like the IGO-L does. That was my reason for not going with the octopus... although the colors are way cooler! I like the IGO-L. It works fine, easy to rebuild.
Don't know about bamboo wicks, as I just use fiberglass, size 2.0 from MVS. Fiberglass is probably not good, but neither is silica from all I've read. I thought about cotton (candle wicks), and bamboo, but not sure where to get some. Locally, I can't seem to locate anything, but I really didn't hunt very hard.