I use this one often and I'm not sure if it is because of the people responsible for upkeep, but it seems to often get loose and has to have parts tightened. Otherwise great variety of adjustments.
To be honest, I don't even remember why I ordered these, but I only have 10 pounders. They do the job and are sized with the rest of my bumpers so work just fine.
Was purchased second hand with a pile of other items, otherwise this is a little set up intensive. Thankfully I have spare plates to keep it in, but otherwise it would be more burdensome.