Meowzer, i didnt see much difference either. However, i literally spent about 10 hours pouring over all sorts of online forums and googling information on the different overflows and the closest U Tube type to the lifereef i read about was the the eshopps overflow found on the bay for about 50% less. I was just about sold on opting for that one until i was reading some reviews of users that said the build quality just isnt as good and they were louder and some saying they accumulated bubbles more often.
Here is just one negative review i read on the eshopps u tube model from someone:
"I have both a LifeReef and an Eshopps one. The LifeReef is better, hands down. The deeper "boxes" mean better flow. In addition I had to modify my Eshopps one because the baffle in the outside box wasn't high enough, and would lose its siphon when the power went out. Whereas my LifeReef one hasn't lost its siphon in the 8+ years that I have had it."
I read reviews of people that have used the CPR, eshopps, and lifereef brands and whenever i came across those reviews, they mentioned lifereefs was hands down the best. I am not partial to any one particular brand either. Wanted the safest, easiest item to use.
Basically it came down to lifereef's is the only one i am aware that offers a guarantee not to flood and have not once read a negative review other than perhaps they are costly. None of the other ones have a guarantee and have read at least one to several negative reviews of them. For the CPR to work efficiently you need the aqua-lifter pump, right? That is just another mechanical device that if it should go haywire while you are away it can cause issues. At least that is what i have read. Above all i am sure a lot of the negative reviews are from operator error and ignorance on how to set up the CPR properly, but i cant imagine it to be rocket science either.
So for me it was an easy decision. I am sure there plenty of excellent operational brands of overflows out there and people go without a flood their entire life
So i guess when i am buying something that involves potentially flooding i opt for the one that offers a guarantee against it. You have to pay for it, but paying for a little piece of mind is worth it IMO