Glad you found the pump for your system.
But I am confused about the conversation.
Sounds like someone from Abyzz told your LFS that a competitors pump wouldn't work?
How???
Sounds a little???
I agree, I'm a little amiss myself, if you look at the specs. Red Dragons 100W pressure rated pump actually has a higher flow rate than the A100 but a half a foot less head height.....
The only thing I can think of is they were comparing the RD 100 Flow pump to the Abyzz A100...
But all that aside @mikedb I'm glad you finally settled on a pump and that it is working great for you ! At the end of the day that is the most important part.