Has Anybody Compared NAP 250 DR and NAP 300 DR With ATC SCM 19 v2

Has anyone done a home demo or dealer's demo on the ATC SCM 19 v2(passive) with both NAP 250 DR and NAP 300 DR? I would be interested to know if the NAP 300 managed to bring more benefits, compared to the NAP 250 when used on the SCM 19 v2 (the latest version).