I've use both the Mystic Matt and the Boston. Of course both matts depend on what turntable etc., but on mk 80mm acrylic platter the MM is a distinct improvement in most areas, while I probably wouldn't use the Boston long term. On Garrards, both work very well. Havent tried either on really high mass platters. They don't work in all circumsatance. For instance the mystic's designer doesn't recommend it with SMEs. As usual these matts will be system and taste dependent.
