Yes, it's dedicated but seems to work here. I had a 220 without the swivel head and the results were less than satisfactory but with the swivel head I have some degree of control. I got full trade-up on my 220 too, which was a nice surprise.
One thing is certain, the flash I get from the 420 is anything but meek. That's where the swivel head comes into play, if the force is too much I just turn the head upwards.