I don't have the controller. It would be nice to have, but with just the fans, it's only an item of convince and not really needed.
I have one in my 2.3x2.3 tent as the sole fan and it does fantastic and not maxed, but on oscillate.
The other is in my 2x4 as a supplemental fan. I have a big cheap 12in fan hung upside down in one corner, angled down, oscillating and pointing to the opposite corner.....to the new fan. The new fan will handle the undergrowth when they get that big.