I would consider the Raypak heater before a Hayward unit.
Here are the list of issues I have run across on Hayward's that are within the 5 year old range. Leaking heat exchanger, bad keypad, bad gas valve, bad ignitor board, and bad display board. I have seen this over and over. In my opinion, this is NOT Hayward's best product. The older ED2 series heater was their strongest units ever made and had very few failures.
Raypak on the other hand has been a very solid player in the heater market for a long time. They have a unit that is a very solid performer and from what I have seen over the course of the last 5 years, very few issues. Unlike Hayward, Raypak is pretty much a pool heater company and focus their sights to be the best. They do not make pumps, filters, automation, or chlorinators. So they can focus to make a great product.
OK I'll step off my soap box now.