Rudi Riet
AKA songfta AKA randomduck - a USSS coach, as well
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I don't understand the difference between the RS and RX. I tried on a pair of RS120 lv. Best boot I have ever had on my feet. It's a very comfortable boot and the flex seems lower than 130. Then again flex changes when you are skiing due to temperature. The boot moves forward smoothly and easily.
The RX is a softer and wider boot than the RS - the former is aimed at all-mountain skiers, the latter at frontside-only and racers. Not that you can't ski the sidecountry with a RS or couldn't bang some slalom gates in the RX, but they have their niches.
And yes: the RS gets stiffer in the cold (as does the RX, for that matter), though the dual-density setup made this a bit less pronounced than the previous models. Is it a full racing plug? No, but it doesn't claim to be one.
The Shadow will definitely make the difference between the two lines more pronounced, reducing confusion. If you want the old-school Lange look and feel, get the RS. If you want the new-school tech and more progressive flex profile, get the Shadow.
As far as the RS120SC is concerned: it's a great option if you have larger calf muscles and a shorter tib/fib setup. It doesn't work for everyone but it's a great option. Most racing boots offer this style of shorter cuff, FWIW.