All the products on the love-scent.com site are reputable and you get what you pay for. In the case of Primal Instinct though, which is very expensive, the high price is due to the extremely high pheromone content. It is not any more effective than say APC, which has the same TYPE of pheromone in it. It just lasts a very long time, since you only need to use 2 drops per application. The others have different pheromone mixtures and many have fragrance added. You could take a look at the "pheromone forum" for some user stories. All their brands have big fans.
Be careful of bootleg products and web sites. There are many phonies popping up. One has an address very similar to their products and looks almost the same. Watch out for that. All LoveScent pheromone products are the originals and carry a guarantee.