I train in sets of 8, 8, 6-8, 6 or 4-6! I'd consider that as low reps! I've got pritty much nothing but good things to say about pre-work outs! I normally do 2months on 1month off with them, I don't feel like shit at all! But I definitely lift "harder" when I'm on them! Aka get right into it! In the end it's your choice and they do cost money but definitely worth there weight in gold in my opinion.