The drivers if they are indeed the same ones Salk uses are definitley high quality, but just putting drivers in a box doesnt tell the whole story, the overall design, porting, shape, crossover circuitry, box volume, baffles, bracing, etc...In the end to tell if these are really as good as SALKS where is the frequency plots, on and off axis, and in the end its the ear that will tell the truth how good these are etc...
Dont really know how close to Salks they really are just because they have similar or same drivers...doesnt make it so.
There are a few other DIY kits that use like drivers but arent that great in their final product.
All the best
Alex
Note: I am about 15 miles from this vendor!