I have a Battery MINDer. It's only 1.5A. For the desulfation/reconditioning, the general idea is to get as strong (amps) of one as you can afford. The NOCO genius line is very popular. They have 1-, 2-, 5- and 10-amp smart maintainer/chargers. I would think that, being "smart", they'd lower the amperage on the charging and desulfating if the max power wasn't needed at all times to avoid over-charging and/or heating the battery. But, I haven't researched them to that extent.
If your battery is in great shape and you don't need lots of power, the 1.5-2A units from either Battery MINDer or NOCO would be fine. I kept mine on my Tahoe cuz it sat for 1-3 weeks at a time. I wanna put it back on the maintainer but I think I need a different one since my new battery is an AGM. Maybe I'll stick the old on my mower.