Using electric fans means that you're relying on them to keep your engine cool when needed, which is mostly in town. On the freeway, there's enough airflow that they aren't needed. I believe that you just need to be doing over 35 mph to no longer need the fans, but that is not a statement that I can back up with any facts or figures, so take it for what it is, just an opinion.
If those fans crap out, or worse, if they break and damage your radiator, what will you do? Does that brand have a good reputation?
Just so you and others reading will know, I took off my clutch fan and am using a pair of Spal 12" fans. I made a place for them to hang about 1/2" behind the radiator and did all of the wiring as well. So that just means that I know the risk I'm taking after having switched to electric. Those questions were some of what I considered before taking the plunge.