Mactone amplifiers

Has anyone auditioned the Japanese Mactone amplifiers (esp. XM-IIA integrated powered with KT-88/6550 tubes)?
I am currently using a Mactone XM-IIa with a Resolution Audio Opus 21 driving Merlin VSM-MX speakers. I replaced a Manley Stingray and the Mactone is in a different league. Smoother with more detail as well as bass punch. Highly recommended!
Thank you!