Conventional wisdom is that Vandoren's Java reeds are strictly for jazz playing; however, that's not really the case.  I play a Yamaha YAS-62 and use old, refaced 1950s and 1960s, big round-chamber King and Conn mouthpieces.  And that's for jazz and classical playing.  On that type of mouthpiece, I find the more conventional Vandoren reeds to be too bright sounding, and actually greatly prefer the Javas for classical playing.  There's a roundness and depth and lack of sizzle that, in my experience, is far more flexible than what is possible with Vandoren's other styles of saxophone reeds.