I have the TRUE with a Sharkoon fan attached. I lapped it when I got it as the base was pretty uneven.
I had an ACF7 Pro before, and tbh there is little difference in temps when idle. When load is applied, I see quite a difference to both cooling potential, and most importantly for me, noise.
The ACF7 Pro was really loud when it was at full speed, whereas I can run the Sharkoon fan on my TRUE at 1200RPM, which is virtually silent and keep pretty acceptable temps.
I would say the TRUE is a superb cooler, and it has much more potential if you aren't too bothered by system noise.