I have a Flyer. It is my first and only Brooks. I chose it over the B17 because I broke my back at age 18 and figured I'd need the suspension when I got back on a bike after a 15 year hiatus. About the only time I notice the springs compressing is when I hit a pothole or some such. I find this rarely happens as I intuitively avoid them or stand up slightly.
If I had it to do over I'd probably try one of the VO saddles or spring for the B17 Special as they look so much nicer. If you ride less than 10-15 miles at a time, I don't think you'll miss the springs a bit.
The B17s look sleeker and don't have the springs to get in the way of certain types of saddle bags. I've used an Australian leather care product on my Flyer and both my wife's Brooks saddles with good results. It's the real deal made from horse fat, I think. Got it from the leather shop down the street. Not vegan approved!
The best suspension comes from your legs and big enough tires at lower pressures.