I've only heard the Merrill VERITAS at a show (Capital Audio Fest) so it wasn't under the best of conditions. Having said that, I think there are at least two more choices for slim-proportioned class D monoblocks that you might want to consider:
Anthem Statement M1 ($6998 / pair)
http://www.stereophile.com/content/anthem-statement-m1-monoblock-power-amplifier
Bel Canto Ref1000M ($5990 / pair)
http://www.stereophile.com/solidpoweramps/bel_canto_ref1000m_monoblock_power_amplifier/index.html
Both are on Stereophile's Recommended Components list, if that matters.
Anthem Statement M1 ($6998 / pair)
http://www.stereophile.com/content/anthem-statement-m1-monoblock-power-amplifier
Bel Canto Ref1000M ($5990 / pair)
http://www.stereophile.com/solidpoweramps/bel_canto_ref1000m_monoblock_power_amplifier/index.html
Both are on Stereophile's Recommended Components list, if that matters.