It's a great game, although it is probably my least favorite from the Ys series. I am in the midst of an Ys run right now. I beat Ys Book I & II last week on the Turbo CD and the DS remake, then I played Ys III all the way through on my day off Monday on my TurboCD, very short game, only a couple of hours to beat, that includes taking a break for a nice lunch. Currently playing Ys IV Mask of the Sun for the SFC, next will be Ys IV Dawn of Ys(my favorite Ys game), then Ys V and Ys V expert on my SFC, and finally Ys VI on my PS2.
Ys III is a great game, even if it is short, the music is outstanding as it always is in a Ys game. The voice-overs are a little cheesy, but it was made before voice-overs were a big thing, so there's a certain charm to its cheesiness.