I definitely notice a difference with my make up application if I use/do not use this primer first. This primer helps my make up application as it gives a good base for my foundation/concealer to sit on. When I don't use the primer, I find that my foundation looks stodgy and patchy, as well as being very difficult to blend and spread.
This is such an affordable product, I buy mine off of iherb. I'm quite new to primers and this was a very good one to start off with. I'm not sure whether it is the best on the market but for its price, I would presume that it's up there. The packaging is basic but doesn't look 'cheap'. It uses a pump which is a good way to distribute the right amount of product; I have not had any problems with the pump.
The primer feels silky and has a silicone smell to it which you get used it although it does put me off the product a little bit.
I have only tried the green coloured primer, but i love it. it is my daily primer, it feels so silky smooth and creates a great base for foundation. i love that they offer all different colours to help counteract discolouration.