Light? Yes, but, for tubulars it's average weight. AND, for the price (BORA's in U.S., about $2700.00), it's not hard to find or build tubulars 2-300g lighter for about half that price, or certainly, allot cheaper! Don't know if that's true in EU, you tell me.
Yes, IF you use crap parts like American Classic's and don't care about aerodynamics.
But I have lost my nervers for hippie parts that are made in Asia...in paper they look light and cheap but in rear wold they suck hard. Hubs that lost their bearings in half summer, rims that hasn's weldet etc.
Buying Record etc. you can't go wrong and you will get lest desent life span. In EU new Bora's cost ~2000€. Not cheap but good wheels for years.
For comparison I had Zipp 360 rims/Am.C hubs/X-ray spokes last summer. They where 1283g/900€ with good deal. Both hubs blowed in a month (also in another clicher pair) and Zipp rims had bad stability problem, one place in rim for every rim was much heavier so spinning was not perfect. What a sh_t!
My friend races on first type Hyperons. Always working and no faillures. Even on hard races that includes sand roads. Thats quality.
But If you hang your bike only in wall then you can drill your SLR, use AMC hub/Nisi Gold rims/120g tubulars etc. But ride more....