Hi All,
I use the Airush 3m Trainer kite in my school and with friends or family. The difference with using a name brand like the Airush 3m is for a start you get top quality bar and lines and also a well made kite.
The Airush one comes with a safety leash so you can let go the bar and practice like with the real thing. I recommend the 3m over the 2m as I have found in my experience of teaching that the fast, smaller kites do not represent the way a "real" kitesurfing kite feels in respect of turn rate and power.
It is possible to teach people using the smaller faster kites with less power, but some have difficulty in transfering those skills to a full sized kite as they are used to a much faster reaction from the kite. The lesser power can also give learners a false sense of security with regard to dealing with the power of the larger full sized kites. These are real life experiences I had with students over the past 5 years.
The 3m has a considerable amount of power even in 8 knots and turns at roughly the same pace as a 10m inflatable. This causes your reactions to be more in line with a real kite and prepares you and gives you respect for the power of the real thing also.
The slingshot 3m trainer foil is also good but does not come with a leash.
As Matt suggests, I have fixed a quick release fitted Harness Loop, to the bar for one handed flying and practice of flying hooked in. I dont really think that it is important to fly with your eyes closed, that is a skill you will master with time anyway. More important is to learn to fly using your peripheral vision to see the kite rather than focusing on it directly.
A half dozen hours of trainer kite flying will save you 1-2 lessons in money and time and will allow you to have heaps of fun while learning and offer the ability to share with friends and family without huge concern for their safety or the safety of your full sized kite. They are also heaps of fun on a sk8 board or buggy. Just dont hook in in gusty winds on a sk8ey unless you want to lose skin.

Hope we all get some good wind soon!
Darren Marshall
Australian Kiteboarding School