I really enjoy their music, but it's very much an acquired taste. It's very romantic, full of waltzes and over-the-top sweeping symphonic passages, interspersed with beautiful piano interludes and energetic progressive rock sections of some complexity. It can be extremely beautiful at times, and irritating at others. The music is very well composed and professionally executed. They're certainly no amateurs.
To start off with, I'd recommend either "In the Region of the Summer Stars" or "Touch Me". They're both instrumental and probably the closest of all their albums to the standard progressive rock sound of the mid-seventies.