I've got a bit of a down on the BL-700 as mine managed to cook a set of 2700 AAs severely enough to start to melt its own casing. AAAs won't fit properly now. 
ISTR from a previous thread that you have the version prior to the BL-700 that allows charging at 1400mA, or is it my bad memory? It could be that that problem is fixed in the newer version. I hope so, the BL-700 is supposed to have a thermal sensor.
Quite right - it was an earlier model (IC8800, now I inspect it). Blue with black buttons, looks the same otherwise. Max charge rate 1800mA for a single AA or slots 1 & 4 , or 1000mA for 4, 3 or 2 adjacent slots used.
It wasn't a high charge rate that did it - 1 pair of 2500 and 1 pair of 2700 put on at 500mA and left to charge overnight. In the morning I'd got 4 cooked cells and a charger with a distorted casing. The thermal sensor obviously hadn't worked - the instructions say it's meant to stop charging if the temperature goes over 53C and wait for them to cool off.
The WizardOne is nicer anyway, even if more expensive. Charge rates are 200mA-2000mA in 100mA steps, discharge rates 100mA-1000mA, and it's much easier to program the 4 slots independently than it was with the Technoline.
Modes are charge, discharge, test, cycle and break-in, with test being charge, capacity measure and recharge, cycle being a specified number of charge/discharge cycles, and break-in being a timed 1.6 x specified capacity charge at low rate for new or long unused cells.
Ljerams:
It's not uncommon to get the odd duff cell in a pack of 4. If you use one bad cell with 3 good ones, the bad one runs flat first, then the other 3 start to force current through it. That damages it, so it runs flat even sooner next time.
Ideally, you should charge and discharge the 4 cells individually a couple of times before use for real. That way you can match cells of the same actual capacity (what you get from a set used together depends on how good the worst cell is). Also bad cells will often recover after a couple of charges if they haven't had the other cells in a battery forcing current through them.
This is why some of us spend money on expensive chargers.
