Personal experience only - Komplett are good.
I've bought quite a bit of stuff from them and had one RMA which was handled painlessly.
And judging by the tone of their newsletters they seem to be trying harder and making an effort.
But like I say, that's just my experience.
The main factor here is that I've had an RMA with them and it was handled OK.
Mostly the only people who say e-buyer are OK are those who've had no faulty equipment and whose orders arrived correctly and on time.
I could say the same for Dabs, I've never had a problem with them, but there again I've never had to RMA anything with them. But I've read loads of complaints about Dabs so I try not to use them.
I think Komplett are OK, worth taking a chance, for sure.