@Cork Thanks! I must add to my comment that time is for sure longer with tebori, but you are also certainly aware that what you get there is really unique, for everything, from the trip itself (hey, it's Japan, outside the workshop!), the quality of the design, the intensity of the colors (tebori HIS more vivid and long lasting, this is for sure, I saw 20 years old tattoos done by Horitoshi whith my own eyes and I can tell), the genuiness of everything you will experience... that it is worth it. Really. If you do love irezumi, don't hesitate. Also, you will find that, even if it may take some time before he answers back, Horitoshi sensei is really kind and open minded, so just email him! Good luck!