I switched to a battery tender with "Desulfation" feature a couple of years ago and my batteries seem to be doing better than when I had just a straight tender attached.

I keep a 2A charger connected to both batteries in the boat and the same charger connected to the battery in the Harley and both seem to always be topped off and ready to go. I used a standard tender on my last Harley Battery and got 8 years out of the original factory battery.......not too bad if you ask me