I got the XF250 pump only in and broke it open.
At first glance there are no differences between the xf250 and the xf150 IF you've kept up with the latest spare parts.
But once I started taking it apart the very subtle build quality or quality control improvements was apparent and greatly appreciated. With the previous bushings it was such an extreme tight fit a hammer, vice grips, and punch out was required to remove for some of my parts. (I have a billion spare parts now...)
Everything on the xf250 was very smooth to turn, twist, take apart, put back together, etc. More so then the original xf150 with all original parts.
It seems like they listened to us or they figured it out on their own but either way its very nice how everything seems to actually fit together the way its supposed to and easily.
Also, they included snail guard sleeves which is SO much better then the useless foam that they were including that clogs up in a day. I'm going to use them as they seem perfect and exactly what I was looking for! Awesomeness. No cutting and sewing or zip ties as you'll see in the pictures below.