If it helps, I can share my experience with my pool. I had a Jandy Lite 2 put in originally - basic unit with a pilot light, no electronics. It lasted 6 years, though when I first had the pool I wasn't good about calcium levels and balance so I am not out to slag them. It was a basic heater though. I just put in a Hayward H series Lo-Nox, model H250FDN, and it is like trading in the Pinto for a Porsche. Cost wise, it was $1,650 (Canada) vs. $1,400 for similar to what I had, well worth it. Prices are cheaper in the US, and depending on shipping it can be found for around $1,400 with shipping, or less without.

I am fortunate enough to have a relation in HVAC with gas papers, and who has done pool work and when he took the panel off he said the Hayward was built like a high efficiency furnace. It also doesn't require a wind stack like the cheaper ones do, which makes the price difference less. He said it will use significantly less gas than the old one. When he was doing work with a pool store, he recommended Hayward over the other brands they carried and his experience with their heaters was good. He had not seen this model before and was impressed.

Nice compact unit, pretty light as well. Slick design and you can switch the returns from one side to the other by lifting out the modular unit and turning it around. You lift it out for maintenance and cleaning as well. It has an electronic ignition as well so no pilot, and winterizing is a very simple, with one drain plug. By law here, if I don't light the pilot, a certified gas person has to come do it in the spring. No need with the electronic ignition.

If a pool heater can be sexy, this is it :-)

If you are heating, be obsessive about using a solar blanket to keep the heat in. From the links below, not using the blanket can increase your cost by 4-5 times.