I’ve tried about 4 different extension brands mainly due to more choices in color combos and styles. Balayage vs traditional highlights etc.
I have found other companies the hair gets tangled at the back of the neck, the hair on each clip is thinner, and GS extensions last longer.
My only complaint is that some of the clips lose their tightness and I don’t have time to replace them with a new clip.
I would also offer repeat customers additional discounts for coming back and free items like the hair bags or a brush.