I'm not really familiar with the older Maha models, but the newer ones seem to be pretty solid performers based on reviews, recommendations, and my own use.

I've been using a Maha MH-C801D (8-battery capacity for AA or AAA or mix of the two) for close to two years now and just picked up a Maha MH-C9000 a couple of weeks ago.

The Maha MH-C9000 is much more complex in its functions so it takes a bit of getting accustomed to (and does only 4 batteries at a time), but man does it do a lot -- and seems to do it very well, based on my limited use thus far. It's been amazing at analyzing old batteries so I know where I stand with them (knowing what their true capacity is, especially so I can weed out the poor performers and even try to bring some new life back into them -- something I'm experimenting with using this new charger).