Perma-cool electric fans experience - are they any good

I am looking to improve my cooling on my 1st gen barracuda. Of course, space is super tight

Looking around I found the perma-cool 19120 - which would fit (basically the same size as the current spals 0435) but claims to have 2300CFM which is almost 3x the spal which is rated at 802CFM
Perma-Cool Standard Electric Fans 19120

The summit reviews, are mostly good. But these numbers seem to go to be true

Anyone using perma-cool? Feedback would be greatly appreciated