I am moving into concave faceting I need a recommendation for a made in america concave facet machine from someone who knows about concave faceting. Thus far I am most impressed with the OMF machine. I am not impressed with the 220V machines made outside the US. The Ultra tec is nice but twice the price of the OMF Please advise..Today is Jan 13, 2019 please reply soon. Diamond$ thanks in advance.