I have both the FoxPro Firestorm and the Primos Alpha Dogg. I don't think its fair to say the Primos calls are junk. Mine has treated me well over the last couple years. Here are a few of my observations from owning both.
FoxPro: Has real animal sounds, good clarity, smaller and light enough to go in a rear vest pocket. Only comes with 50 sounds, some of which I will never use (mountain lion, bear cub distress, elk calls). Also, FoxPro is made in the USA and has a great reputation for quality construction and wonderful customer service.
Primos Alpha Dog: Much louder than the FoxPro, also has good clarity, and has a bigger selection of sounds that are categorized. The remote has pre-programmed "expert hunts" and the sounds are timed. You can also program your own custom hunts, so that you can just hit "play" and let the caller run. I believe most of the sounds aren't real animal sounds, but rather made by people (mostly Randy Anderson) on mouth calls. The unit is too big for a vest pouch, and is heavier than the FoxPro. The caller seems to be a well built unit.
I think it's fair to compare the two. I can't say that the FoxPro is head and shoulders better than the Primos. I wouldn't run out and spend 3 or 4 hundred dollars on the FoxPro if you already have the Alpha Dogg. The only reason I did is because I had money to burn at Bass Pro and the Firestorm was on sale.