I've just done my second box of this colour and I'm really impressed.
I've picked it up on special both times for about $12 so excellent value in my opinion, it has everything you need included but my fave is the conditioner which easily gives you a couple washes worth, and the colour only takes 30min to develop. My hair is medium to long in length and quite thick and I'm able to spread one box to cover it all.
After using my hair has been left super silky & shiny and I've always gotten compliments on it. The only downside for me personally was the brighter colours do fade after a few weeks, but the more natural colours last well, dark brown is my favourite.