Double wishbone is great for camber and multi-link is great for packaging, but the devil is always in the details.
The boominess of the car over road issues, especially in corners, is what makes me say chassis flex. I certainly don't feel the car is well connected to the road on anything but glassy pavement, which I'm rarely on.
I don't feel the car handles responsively, except for the accelerator. The steering ratio is quick, but the car doesn't really respond especially quickly to inputs.
I find the ride on my 2013 FRS is far more livable on bumpy roads. Events are far better damped. It's not as nice on smooth surfaces though, and it's far from a smooth ride. Meanwhile, our Forester is a relative magic carpet ride, despite 90k on the front suspension (rears are recent Bilstein replacements).
My problem with MPP is that they don't give out much information on their products. That makes me think they're not choosing the best parts.
My problem with Unplugged is the price for KW gear. I can live with it. KW isn't always the best, but they're certainly acceptable and, I hope, an improvement over stock.
My problem with Redwood and their Ohlins is the cost. Also, they haven't discussed track testing or anything like that. They're not as adjustable as the competition, but then if the product is good, it shouldn't really need adjustments.
Not sure what you describe as 'boominess'. I feel there is boominess, but it's a consequence if being a hatchback with a big boombox area in the back.
Cargo covers aftermarket kits or some blankets can help, but not cure, that issue.
I associate boominess in suspension as too stiff, with too much bounce response to bumps and uneven pavement. We've both agreed the dampers/springs are a mismatch.
Handling response on the Gemini 255/45/19 Conti's on my MYLR is good for such a heavy car. I find the steering ratio a touch too quick.
The 255/55/18 BFG's I put on M3 Aero wheels add some mush to response, and take out some suspension bounce, particularly through rain trough - type depressions.
I have zero experience with Subis. My history is BMW, Audi, Porsche, Porsche racing, Lexus, and Chevy Avalanche (a great SUV). I don't do any real off-road.
That said, I do understand suspension development, having done it for 10 years racing Porsche.
Torsion bar vs coilover, swaybars, compression/rebound damper adjustment, tire pressure effects, you name it.
You might be over thinking the suspension component qualities - it's a road application. Any of the components will hold up to the environment of street driving.
All three companies have put in the time and engineering to make a credible solution but are hostage to the partners they've chosen for components.
They're not manufacturers, they're integrators. And they've done it pretty well. There will be more coming; I've spoken directly to one.
All three HAVE discussed track testing. Pretty extensively, but most is more 'time trial' type driving vs racing. "Time Attack' is just a fluffed up title for time trial events.
I'm not interested in dropping the ride height (just exacerbates the issues we're both discussing), and the better solution at stock height is Redwood in that regard.
$750 bucks difference one way or the other over 5 years ownership is minutiae.
