I you have an Apex then go Neptune. I have not had any real issues with mine, I have replaced the pump once in 5 years. If you dont have an Apex go with Tunze, they are the most reliable out there.
can I throw out I have an aqua duetto 2 on my apex -- and I have had no issues with it - but still can control it and have different/back up sensors from the apex brand to go with the duetto sensor