Steiners are damn good for the money. I can't see that they match top end Swaros or Zeiss. Both will be sharper and brighter, (and to my eyes Zeiss HT have the edge over, well, anything) and so they should be, they're four times the price. But they're not four times better. You pays your money etc etc..
Swaros are worth the money for the lifetime guarantee and customer service. Unless you want to upgrade to a different model you will never need to buy another pair.
I prefer the image quality of my Ranger Pros over my mate's Minox of similar price. I've also tried them back to back against a pair of Zeiss HD at £700 and I thought the Steiners were superior. The colour balance was better for one. Everthing seemed greyer and flatter through the HDs. I wouldn't change mine unless I was going for Zeiss HTs or Swaros.
The eye cups have broken though. Something's let go and they spin freely so the blinker flaps can't be used. I should send them back but its the thought of going back to a pair of scratched Bushnells for however many months.