I'm no expert (in the ukulele in general, let alone a low G tuning as this is the first time I've done it), and I have nothing to compare them to, but I've got D'Addario fluoro strings on my Tenor which is an unwound low G - they play nicely, stretched quickly and stay in tune well (I don't play a huge amount and split my time between the tenor and my concert). I didn't need to open the slot on the nut either, although whether this is down to the instrument I don't know. The strings seem very similar to the string I took off though (which I believe were standard Aquila).