It's great for fast melody playing, especially for Irish and other fiddle tunes, but also good for pop and blues playing. I have extensive instructional material for Paddy-Richter.
Now it's available in an extended range version too! Strictly speaking, it should be called 'Double Paddy-Richter' on the Lucky 13. That's because the normal Paddy-Richter low octave scale (with 3 blow tuned up a tone) is repeated an octave lower. This makes the Lucky 13 version great for chords and octaves!
As with my 10-hole Paddy-Richter harps, the Lucky 13 version is half-valved. Half-valving is another invention of mine, an innovation that gives you a lot more soul and volume on the notes you can't normally bend (lower blow notes, upper draws), whilst retaining all the normal bending reeds. If you already like Paddy-Richter, you'll love the Lucky 13 extended version!