I used Bronkaid for years and only last year switched to Primatene. At least to me, it feels different and stronger. Probably won't go back to Bronkaid.
I just switched to yohimbe and worked my way up to 15 mgs at once and like it even better for fat loss so far. Next to around I'll do primatene and bronkaid back to back one more time to see if I can feel a diffrence. Maybe if I go back to back I'll be able to tell.