I have two of the all steel Costco ones (can't remember the manufacture) they carried several years ago and they have been wonderful! They are very heavy like someone else mentioned earlier. They later replaced the steel model with a hybrid steel/aluminum version, but that one did not look like it was as low of a profile as the all steel one, which barely fits under my z as is. I've looked at my 2 local costcos on occasion and they seem to no longer carry jacks...have not seen any in quite some time. I've asked myself this same question if one of my two fail. The Costco one came with a rubber pad that covered the jack point, which I really like. Seems like the HF and Northern brands do not come with them. Anyone recommend a good rubber pad for these jack for future reference in case needed?