Any smart charger that uses -deltaV is going to work fine. Stay away from slow chargers; they have no intelligence and can wreck batteries. Battery charging is a well understood technology, and it's not like it even costs more to make a good charger than a bad one; once you put in a microcontroller, it doesn't cost any more to program it right than to program it wrong, so there's no immediate cause to think that the cost of a smart charger indicates how good it is.

I have a MAHA now (2 actually) but I've had them since before other smart chargers became available for cheap. I sure wouldn't pay the $40 each I paid for them originally. Any smart charger contains a power supply, a battery holder, and a charge controller. The difference in cost to manufacture a $40 charger and a $12 charger is probably close to zero, the difference is strictly marketing and profit.