I outlined my concerns here: http://www.MrSaltWaterTank.com/3-pieces-of-equipment-you-should-never-use/
I've known several people who had their HOB overflows setup with the aqua lifter (including by some "professional" tank main't people) and they all experienced a flood at some point.
If you had to mod a piece of equipment to make it work correctly from the start, clearly there is something wrong with that piece of equipment.
Imagine buying a new car and the salesman says, "ok, here if your new car! Now to make it run you have bang on the hood twice, turn the key a certain way and add this ADD-ON piece of equipment to make it work correctly"
If someone said that to me, I'd RUN.