Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do not buy this ...

Although several reviewers have had good luck with this "compatible" cartridge, my HP-430 plotter worked for a limited time w/ the first one installed, then refused to print with the second "brand-new" unit. I used my postal scale to compare the weight of a genuine "HP - 40" with these. My "used-up" one was only 3-4 grams lighter than brand-new and the new one was spot-on the same weight. It may be that used immediately after arrival, these cartridges will be OK, however my plotter cartridge is changed only 4-5 times a year so the extra expense of a ***** rated genuine HP cartridge that has worked every time I need one no matter when purchased is a better value ...