I've been playing an 8-string guitar for about a year now and its almost like a completely new instrument with all the possibilities it opened up. When I go back and play one of my 6-string guitars now it almost feels like a toy. I highly recommend a multi-scale 8-string though, especially if you are tuning low with the heavier strings, because it helps eliminate that "floppy" factor. Fanned fretting was also surprisingly amazing in ergonomics and comfort but also in speed and accuracy.