I have their reinforcement plates on two other of my PX's, and they are alright. I do think they should be a little more thick since as is, can still get distorted from a 160lb person just sitting on the scooter. I would still recommend them though.
I like that reinforcement plate for the stand. Didn't know someone made one for that. Both are definitely on my list now as the floor warps a little if I load the bike up too much and put it on center stand. Great stuff!