The radio system lets you easily control all your flashes from the camera with some using TTL and some on manual and even switch modes without having to touch the flash. It's just amazing.

Supports both radio and optical triggering, so if you have the 400EXII's you can slowly convert over without having to buy a radio transmitter on day one; Great power and good batteries will last for quite a while

Price

As always I got what I paid for the best of the best. With the discount and lifetime support from the best company on the net .

Canon

None

Pros: Everything Cons: Non Other thoughts:

I have only had a small chance to use this, but so far I love it. I have a 5d Mark 3 and the camera will controle the flash through the menu. It is nice to have a flash that will work with the full range of my 70-200mm lens. The only down side is the price, but Canon had $50 off.

Easy To Use; Fast Recycling; Powerful Output

Heavy

The battery charger that came with this is junk. It does not indicate when the batteries are charged. This means you need The battery charger is basically junk. It does not indicate when the batteries are charged. The bracket is a $16 item. The rest of the items are worth very little.

I already have one. I'm buying another. That should tell you something. The radio transmitter alone makes this flash perfect for me. No more pocket wizards. And very easy to fine tune with the rear LCD panel.

Worked completely well~ Good flash!

with this modifier light is reduced by 2 stops the casing is made of thick plastic which i think is a little too thick not for the amateur photographer.

Excellent! Very versatlie and multi-use flash - perfect for almost any situation and covers Canon's low-light deficiencies perfectly! top-notch prodecut and a very competitive price!

Very pleased with the flash. Very powerfull and great light. Well packed and fast shipping (Vistek).