I have them with Lazer spokes. these wheels will be a great surprise for you so I hope.
Of course perhaps it is not as stiff as a 32 spokes wheels about 1600 gr a wheelset or more but I think that Speedcomposite wheels have a stiffness/weight ratio much more higher than an heavy wheels so that is finally a better wheelset. Very easy to accelerate since it is a very light wheelset and stiff enough.
I have no big argue but I am sure rims are very wellbuild cause spokes are very tighten and no problem with that.
I have already try Corima Winium and it is a very very poor stiffness and dangerous to tighten spokes too much rims are not as strong as possible. they are only light. There are also Zipp 202 in the category I nerver ride them but notice that there are not very tighten !!! Perhaps Hyperon can equal Speedcomposite but not sure and when you look at prices the choice is very fast !!!
You won't compare Tubulars and tyres if you ride Speedcmopposites cause impossible to be as light and more efficient. With tyre rims you are 100-200 gr heavier and unfortunately less efficient cause of struture rims.
If you make it yourself don't hesitate to stick your tubulars very well that is better too much glue than the opposite, that is the main thing you have take care of, and centering the tubulars on the rims after many times it will be easier
I plan to ride cyclo-cross with them but need another wheelset it could be great to accelerate so fast in cyclocross.
Bye and have a good ride.
Live to ride, ride to live...