+1 on the "Plus model.... the standard one just didn't look robust enough for me to leave plugged in all the time.
For anyone interested in a battery monitor for their bike to help tell when the battery is dying see here:
http://www.argusanalyzers.com/battery-monitors/applications/motorcycle-powersports.html This little guy has saved my hide a couple of times already on in the past year on two different bikes (AZ heat is horrible on battery life and condition).
