This thing does what it's supposed to do, not overly comfortable to use and the knurling is very passive, overall it's fine and great deal for the price.
Works great, high quality and definitely very expensive. Heavy and awkward to move around but that comes with being overbuilt. Not really an option for storage but it's fine on the floor.
I prefer strap safeties over any other version as they won't damage the bar you're using and these are great. Easy to adjust and they've help up great.
I had these and got rid of them, the knockoff version from amazon is just as good. the other prime attachments I have seem to be higher quality which is strange.