Neros are absolute trash! I picked up a pair of Nero 5s as a backup to my 13 year old MP40s. I have replaced the wetsides once. I clean them once a year. They are bulletproof. I have my neros setup on a 40g backup tank while I rework my main. Every couple of days, they lose their programming and default to a slow speed. I can tell when I open MyAI and the date is 1969. I must then cycle the power on them to get them back on their schedule. If you are debating these two brands, spend the extra money on the Vortechs.