Full user review
"Rubber Ducky is brilliant."
IHere a 9 year old desktop, upgraded RAM to max 1gig, was running RAM monitor/scrubber, it became incompatible with Firefox-5, removed. Installed Rubber Ducky, it's passive, a great system indicator.
I haven't found any cons.
Rubber Ducky is passive but lets you see when you're nearing your system limits. Rubber Ducky is brilliant.