Heartland Harps is a regular vendor at the Somerset Harp Festival including this year. If you’re at all able to make your way out there you can see + hear the Starlight up close along with many other harps for comparison.
I always found the design concept interesting since it opens up a lot of possibilities for moving and playing a pedal harp in more demanding conditions, but never having heard it next to other pedal harps I can’t say anything for the expected compromise in sound.