These strings totally changed the way I play the guitalele.
The stock strings on the Yamaha GL1 I bought (regular guitar strings, I suppose) were dull, flabby, and had bad intonation. You could strum a few chords with them, but it sounded quite muddy at times.
These Aquila strings make the guitalele sounds much clearer and more balanced. The intonation is much better, and it makes it sound like a mini-lute. You can actually play melodies and the chords sound much better. I also played the whole summer without changing them, they last quite a long time.
These are quite expensive for strings, but IMO they are totally worth it and they will make you guitalele sound 10 times better.