I bought chicken nuggets at BJ's just this past weekend. They looked exactly like Rastelli's, I thought I finally found a great dupe.
They were awful. They were processed chicken, then purposefully cut irregularly, seasoned and breaded. Those chicken nuggets tasted like seasoned, edible silicone.
Rastelli's is true cut chicken breast and taste. They're like I would make at home, if I wanted to go through that bother. I don't. Compared to price per pound at a good restaurant (no, I am not speaking of any of those fast food nuggets), I prefer Rastelli's right out of my freezer any night.
Like another poster pointed out, at least do a fair comparison based on taste. Of course they aren't inexpensive. But for these specifically, I'll pay for great taste coupled with my time and convenience (and no more trial & error). It's one of the few food items on QVC that I'll happily purchase.