On our -300s we get a printout every time we do a hard landing (>2gs). I use the ACMS to check on some landings, just to train my feeling of the gs i produced. It's sometime really difficult to judge it correctly, a thump might feel like 1,3 or so but is only around 1,15g, but it might be up to 1,5. A greaser is not a good landing per se, but it is around 1,01 to 1,10g or something.