I looked up the Prelude 40 and it weighs 44 pounds, so if the Pratt lever harps are heavier that’s saying something! But they still probably weigh a lot less than most pedal harps. Wish I could hear a sound clip of one being played.
Obviously we are on different playing fields when it comes to $$$. To me that is a lot of money — even for a good lever harp. I found something I like for much less money, but if you want it and can do it, go for it.