I avoid AEG in general: I had a sander of theirs (cheap 2nd hand machine from a boot sale) and went to a local approved dealer to get some replacement brushes. What should have been days turned into weeks, AEG apparently changed the part number, and finally I got the call to pick them up. I got them home and they were far too big, checking the part number of the brushes I ended up with on the web, it turned out they were for some kind of drill.
Then AEG re-shuffled and joined the Milwaukee/Ryobi group. I was recently tempted by the Milwaukee 5" variable speed grinder (cheapest I could find, and roughly as much power as the Fein at something like 1/2 of the price) and placed an order through a different local dealer, chosen from the Milwaukee list of Service Centers. "It usually takes 2-3 days, and will definitely be here in the next week," said the salesman. That was Thursday 7th Aug. I've chased them up once already, still no sign of the grinder today.
On the other hand, even my local B&Q has AEG cordless stuff on the shelf, it's affordable, and with the lifetime service agreement it is still a tempting proposition. I haven't tried any of it yet. I
asked the same question as you some time back and the replies didn't lead me towards buying any of their cordless kit.
Cheers,
Neil