First of all this is a very nicely packaged kit.
The little book that comes with it is all in sepia/brown colours – even the photos, which isn't too bad but some colour photos would have been nice.
I found the information pretty good, it has things about how to prepare your skin for henna, and looking after your henna tattoo. There were a few things I felt it lacked in – if you're a beginner the kit is easy, but once you've used all the henna in the kit, it doesn't teach you much about mixing your own henna pastes and how to make your own transfers (I found much better information on the internet and there are really good video tutorials out there.)
The book also shows transfers being used for all the tutorials, but I only got two in the pack.
So far my henna isn't very dark, but I haven't had it on for the full 48 hrs yet. I don't think it will get as dark as most people want – I don't know how old the henna is. I'd almost recommend you leave it on longer than an hour to see if it gets really dark.
All in all, I think this kit is pretty good as a one off, but if you really want to get into henna seriously I'd research a bit more. The book has good tips and I'll keep it, but again, if you want to get into henna tattoos, you'll need more than just this kit.