I started the P90X program by using resistance bands but after a bit, felt I needed to really go the true Pull Up route instead.  After looking around Amazon, it made the most sense for me to go with the BMP bar.  I had previously purchased the BMP resistance bands and I'm happy with those so far.  Well, the package arrive (yay Prime) and I quickly assembled it.  Make certain that you tighten the locking nuts really well.  I didn't use the optional but included black "L" brackets and placed it right on the door frame to see how it felt.  It feels very solid and is in no way going to hurt the door, moulding, or surrounding wall.  I'm using a fire door from my laundry room to my garage.  The nice thing is that my garage steps down 6-8 inches so as I place the bar facing the garage, I get that additional height to work with.  Goes up and comes down in < 10 seconds.