People will buy different products for different reasons, in the early years KMD were one of the first with a pump, but did have a few failures due to the design (including one of REVO's own cars). Autotech had a few failures early on as well, but we are talkng a handfull of cases in literally thousands of pumps.
I have sold too many autotech pumps to count, hundreds to Greece and Portugal, Spain, Norway.... and plenty here in the UK. From these I have not had one back for any warranty claim. If you want a cost effective, safe and reliable way to install an internals only kit then its your only real option. If you want a fully built pump and dont mind paying the extra then APR pump is ideal.
As for the flatspot issue, I have seen this on stock, Revo tuned, Unbranded maps, Superchips and right accross the 2.0 TFSi engine range. I have also seen it with Autotech and APR equipped cars. I have been able to work around the flatspot with mapping in most cases but dont believe its a pump issue.
Seal failure is the big issue with autotech pumps, the 2 I have seen with seal failure were both due to incorrect installation (not lubricating the pump shaft during installation through the seal housing) and this is where APR win hands down, installation isnt an issue.