Charging NiMH batteries (like MFLB uses) is not an easy thing to do. The hard part is detecting when the end of charge is reached as overcharging is very bad.
There is a very low charge rate where the extra heat generated by over charging can be tolerated, but this rate is very slow, about 20 hours. Fast chargers rely on a very small (about .03 Volt) drop in voltage, if it misses it, bad happens. Other schemes check temperature, sometimes in addition, sometimes as the prime control. Temperature can go up normally with high charge rates, but it also rises fast at near 100% charge. These types are often called 'delta V' and 'delta T' since they rely on delta (change in) those values.
IMO the chargers MF uses are what we demand (fast and low cost), adequate but not optimum for the job. Better chargers exist of course, with more features. I like the Maha C9000 myself, others are no doubt useful. You have to decide if battery savings/increased performance is worth the cost for you. I use a lot of AA NiMH batteries, for me the decision was already made.
OF