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With the redeye I'm used to having a big pool of light on the ground behind me. Nice and easy to see the light is on/nice and visible, not pointing directly back at other cars/other riders. The SON just seemed a bit feeble in comparison. I know it'll be different for a driver, than me looking at it on the bike. Maybe I'll just find someone to reassure me that it's more visible than it seems...
The SON rear light, as do other B&M rear ‘line’ models, definitely do spread the light on a horizontal plane (which is why it seems a bit daft to mount them vertically as some do) and don’t have any significant beam going up or down. It’s fine. Rear lights don’t need to be brighter. I reckon you’d be better off getting a decent reflector. I’ve not tried the redeye but in general brighter isn’t always better, esp if that’s unfocused and blinding people.
/2p