Solar In Ground Pool Heater Advice?

Hi -

I'm seriously considering a supplemental solar pool heater for in ground gunnite pool in CT. I would be putting this on one of two roof sections which face SE (steeper angle) and SW (lower angle). which would be about 60 ft from my pool equipment.

So far, I'm leaning towards the Enersol system - it appears to be not too expensive (relatively speaking), well made and durable with a great warranty and easy installation.

My pool hovers in the mid to low 70's during the summer (it does not get direct sun all day). I admit, I rarely use the solar cover. Are these solar heaters effective?

Has anyone else used this system or have any other suggestions?

thanks

That one looks pretty good to me too. I'm also considering a solar heater and have no experience. I'm a little concerned with Enersol's winerization procedure - to remove the end caps - as I plan to put it on a second story roof.