Great game, but you probably have to enjoy old school rpg's for it (lunar is more modern).
Vay has my greatest video game moment though. The last area (where the final boss is) is extremely confusing and, when I first played it (mid 90's), I couldn't find a guide or anything detailing how to solve one part of it. I remember going all over the net trying to. After hours (played over a span of weeks) I finally figured it out. I was at the point where I was going to go back to my old save because I was extremely low on items and I was low levelled as it is (the regular monster where giving me a lot of trouble, I ran from most and would have to heavily heal after a fight when I didn't run, as I was about 10 levels below recommended). Finally I get to the last boss. He had a general pattern of attacks (major attack came after a certain amount of turns). I fight him for about 45 minutes, and I get to the point where I have nothing at all to heal, all my characters hp are low, and his next attack was going to be a large blast that hit (and would have killed) everyone. I get to my last attack (next would be his) and attack him, and kill him.
I suggest playing the game at low levels if you like challenges. The boss battles are doable and many can take 30-45 minutes unless you are levelled up (still a challenge then but just much shorter usually). Last year or so I played it again and was disappointed that the boss fights didn't take a half hour+, then I realized my levels were consistently higher than they had been during the first time.