It's nice to know that I'm not the only one that keeps coming across situations where that is the appropriate solution.
The Adorama one looks very similar to the Vivitar 2800 that I have. It's nice and light and simple. It does what it says it will do, so no complaints.
I have a 580EX and have to say that I've found it pretty frustrating - TTL is great in many cases, but it's not everything.
Both the Metz and the Nissin look like better options to me.
Will the master/slave protocols mix and match with the Canon flashes (eg have a 430EX slave) ?
wireless IR ETTL II from your pop-up flash
Is this something that exists in that flash already or something you've asked for ? If so, does it work with my 40D or do I need to buy a new camera too ?