I can't speak for Gymjunkie, but here's a quick list, off the top of my head, of Poliquin stuff I've used:
BCAA Excellence (and the 2.0 version)
Beta Alanine Supreme
Methylator Plus 3.0
Ultra HCl 4.0
Multi Intense iron free
There are probably some things missing from that list, but it gives a good idea of what I've tried. I've used other brands of magnesium, zinc, and ZMA, and noticed more with the Poliquin brand (doses were the same). Same can be said with Holy Basil and tribulus. The Poliquin glutamine seemed better to me, but only after switching back to other brands. I found that Whey Stronger mixed more easily than any other whey that I've tried. Java Stim is basically caffeine with a few amino acids that are supposed to give you the same benefit of caffeine without the jitters, and it works. When comparing brands of BCAAs, I noticed a better result with the Poliquin brand than the Ideal Protein stuff that I had. Poliquin's beta alanine gives me the 'tingle' at a much higher dose, and it feels like a different tingle than other brands that I've tried (which leads me to believe that it was the fillers in the cheaper stuff that made me tingle). Vitamin D is vitamin D. That being said, the gel caps are absorbed better than the chalky tabs. Poliquin's brand happens to be the only one that I can get in 5000iu caps. I did not notice much difference with the HCl products, but the price points are about the same as the other products around me.