Personally, I would not use Nails Inc in the salon. I hate the shape of the bottle handle and find it really difficult hold and to paint nails professionally with it. The fact that Nails Inc polish seems to be given away free quite often in magazines really turns me off too. I think it cheapens the brand. JMO.
I sell and use OPI polish. I personally think this gives you the best of all worlds. Clients have heard of it because of the amount of ordinary press coverage. Not only fashion type coverage, but OPI themselves advertise in fashion and women's magazines. As nail techs we have all heard of the main manufacturers but our clients rarely have. Very few of the large manufacturers advertise in places where our clients will see and get to know them, at least in the UK anyway.
Yes some of the big retailers like Selfridges, Harrods & John Lewis sell OPI, but they are all high end stores who clients associate with quality and they tend not to do promotions or offers. This allows someone like me to knock a few pence off a bottle and beat them on price! The fact that these quality stores choose to stock the brand helps me sell more really.