I had a Brooks Conquest, which was essentially a sprung Brooks Pro (and now a slightly culty item), rode it for years on my daily rider. Finally got rid of it in a complex sale/trade last year.

I don't really miss it, having replaced it with a B-17 on my daily rider. The springs squeaked a lot - you can grease them up, but it comes back. Also, they will inevitably have more sag than a rigid saddle since the up/down stretches them out. Plus, they are pretty heavy.

That all being said, I rode it for about 8 years, so it wasn't like some great irriitant, but I probably wouldn't buy another. I'd just go for a B-17 some plusher tires at a lower pressure, which is indeed what I've done on my daily rider.