Well it's about time. I'm just getting into speedlites and am not interested in:
1.) Spending $1,200+ for a two light kit, or
2.) Buying a bunch of optical-only flashes and being restricted to line of sight.
A 4XX RT flash, if miracles exist, will be priced at or below $399 and I'll be able to afford two for the price of one 600RT.
The 4XX RT flash, when it is released, will almost certainly not have a transmitter. Add in another $300 for that.
Right, but neither would the 600's - I can't avoid that cost, which is why I'm happy to save some money for a lesser flash. Valid point though - you have to include the transmitter with the kit and it's way, way too expensive.