Geez should i answer them in a list like your questions?
1. I do
2.I find them helpful especially if you turn way and need to rudder the other. Others reasons as well
3."Need" no one needs them but look above^
4.As for Brand i don't know, I use Gas and Brake Pedals from my Logitech Driving Force, the tension is fine as i know many people ask me about.