You do what you want but,
Since your buying a kit I'm assuming your doing it yourself. So lets say you have a question or two. Your going to run here and ask advice. Would you want expert advice? Won't you feel better asking the person that you bought this kit from and is willing to help you out? Service and tech support goes a long way after the sale.
Nothing against PPE but they don't design the kit. Individuals like Mike L have put the leg work into testing and putting together kits that WORK!
Think about it