I've been using LeChat ever since they became LED curable, so about 18 months. In the salon that uses LeChat, they use LED only. On my own nails, I've used my old CND Shellac lamp on LeChat as well (1-1-1) and it's worked very well, but I prefer using LED. The colors are fantastic and long lasting (2-3 weeks), and the shine of the top coat is among the best of all gel polishes. But I do not like their base coat, which I find hard to remove, YMMV. Actually, it may be the combination of the base and top that's hard to remove; I've never used them separately. But for colors and formula, LeChat is a favorite brand of mine.