Great quality and lasts long even for more than 2 weeks. The top coat is shinny, which i like. I recommend to only use thin layers of the base, color, and top coat when applying to your nail.
Only be cautious when buying other OPI gel colors like "put it in neutral" and other nudes; the gel color differs from the regular OPI color which is wierd, but be cautious with your selection.
But quality wise and results, OPI is the best.