Never tried the pulse types, but I've never yet had a constant current type charger bring back a battery to any reasonable performance.
Generally, even if they did come back to nominal volts, when charged "for real", they shorted, or otherwise failed, dropping back to a lower voltage. And the couple that seemed to work OK had a fraction of the capacity they should have, possibly because the sulfate dropped off, possibly because much of the sulfate was not "reachable" by the current.
Supposedly the pulse type will convert sulfate that is not "reachable" so long as it has not actually fallen off. I don't know about that, as I've not tried one.
The overall results were more hassle than the cost of the battery. For a forklift, well, it is different. I can definitely see that even if it has to live on the charger when not in use, if it will get one truck unloaded without quitting, it's likely to be usable to many folks with intermittent need for a forklift. Those batteries are expensive as heck.