I think it's great to have access to measurements and information. Regarding SPL units, I own some things from SPL as well as from SMSL (polar opposites!). SPL gives you exemplary build quality (my units will probably outlive me), a very effective customer service (in my experience) and great performance with high impedance headphones. On the other hand, while my SMSL SP400 is not nearly as robust, its sheer performance is off the charts. We live in an age of plenty, I'm telling youI had my doubts about SPL units, thanks for confirming, my money will be safer with me.