Paphiopedilum Wossner Vietnam Star is a primary hybrid between (rothschildianum x vietnamense). I haven’t actually seen one in person as they are not too common. The photos I have seen are pretty impressive. There is certainly great potential in this cross.
Like most primary hybrids, this is an easy plant to grow. Not sure if it blooms easily, but most modern rothschildianum crosses are easy bloomers.