I have been fortunante enough to try out both suspension setups on my car, and so far this is what I have found.

Thought I would let those interested know.
Car : 2000 ITR
Wheels: 16x7 Volk Te37
Tyre: 205/45/16

Spoon - (Spoon Progressive Springs/ Spoon Non-Adjustable Dampers)
Ride Height front:2-3 finger gap depending on how fat fingers are.
Ride height rear: no gap at all, practically a 1mm gap between the top of the tyre and the fender.

The ride was very stable, it soaked up bumps with ease, and never banged into potholes or thumped over tracks. I never quite got to experience what the maximum limits of this suspension was and I did drive it pretty hard around some sharp corners and sweepers. Overall it was a great setup, a little too stiff for daily driving, but the car seemed to glide over bumps and didn't seem to squirm at all. No matter how hard a bump youd hit, the steering wheel would never jump in my hand.

It did appear to have some weird characteristics on high speed corners when going downhill, the backend would just seem to light

Mugen Lowdowns
Ride Height Front: 3-4 Finger gap
Ride Height Rear: 3-4 Finger gap

The Mugen was a different feeling altogether, I bolted it up and drove off with front and rear set at 3. It felt extremely soft compared to the Spoon setup, almost Camry like. I played around with the setting and found the hardest setting to be extremely uncomfortable for the street, The harder settings made the car handle more responsibly and control levels were great.

Daily driving on the soft setting is not one of the best, the suspension seems to drop into holes and road imperfections instead of gliding over them like the Spoon setup. The dashboard shakes on some surfaces, from prior searches this seems to be a characteristic of this setup ? If you hit a bump taking corners the steering wheel jumps and the car lurches around a bit too much for my liking. Softest setting is for daily driving and highway driving only. But it also does a decent job for spirited driving.

I still haven't experience the Mugen setup in its hardest setting for stree, but will being trying it out soon.

Overall the limits of the Mugen setup are quite high, it seems to be the better choice for those that need to do a lot of highway/everyday driving and want a soft ride, but would like to make it hard for a nice firm, responsive blast.

I have this setup set on the softest setting at the moment, but am going to try and find a nice median for daily driving.

 

check itrsport.com he has posted his experience in regards to the mugen lowdowns. I personally had them before i switch to the spoon n1's. The lowdown is quite adequate for daily driving, but it also depends on your roads. In the area where i'm located the roads can get quiet bumpy and hence it feels like camry like, but to each his own. I did like them on hardest setting in passing through the curves.

 

good info, i was working on getting the spoon setup but there were no progressive springs for sale in the u.s. at the time so i ended up going with the bc rsd's. def not the same setup but same price for me.