I ended up going with the Russian Spec just because I'm 50+ and can afford it now. I was coming from a loose and no longer fitting 30 year old JB551 and while the first try or two was a little awkward, the thing is like a second skin now. I do not notice any limitations in stick handling, but one review said it was heavy, and it is...when it's not on you. But slide into that gorgeous design and I don't sense any weight. However, you cannot easily reach your face since the forearm and bicep shells prevent your elbow from bending far enough (and John notes this in his instructions).
Even though I'm level 3 beer league (got the belly lengthened for the extra belly real estate and the arms shorted for my stand up style), I'm glad for the extra protection whether the Russian Specs saved me or not. High chest shots are loud but harmless, arm shots are wonderfully insulated, and shoulder shots just beautifully glance up and off. I love the 2400.