Ahh ok, I get what you mean! With A123's you indeed get really consistant voltage to rec./servos no matter the current draw - the internal resistance (IR) of these cells is amazingly low...

On the other hand considerable voltage drop under load=inconsistent servo speed and handling. Maybe not noticeable in normal flying? But I would rather wear a t-shirt at 0-10 degrees celsius than fly a high amp draw plane in the same weather with 4 cell Ni -pack...or maybe not...Any colder is normally considered the building season - but you Norwegians don't seem to care

And again to repeat myself - I've NEVER had a problem neither personally seen one with slight, 6-7V, over voltage to servos or receivers...

Edit.

...but have seen several planes crash due to one or more dead Ni -cells in the receiver pack. Of course possible with LiFe's too, no argument with that.

And with LiPos you really can have a disaster - a few weeks ago saw totally burned CompArf 100CC YAK due to charging failure - right cell counts and chemistries selected. Most likely one cell was at the end of its life and the other one in 2S pack didn't like the 8.4V charge. Luckily my friend's car was a couple of metres away so it didn't catch fire, everything else was just a huge mess. Should never charge these inside a plane. Even that is THE reason to go A123...