I initially got the Maxspect Gyres for my first reef tank after lots of research (considered MP-40s but it was a little expensive). It seemed to be a good value for lots of awesome flow with a lot of controlability.
9 months later, I started a second tank, because 1 tank is never enough. The theme of the second tank was going economical, hence the CP-40, at a fraction of the cost. I didn't do much research on this, but thought to myself that the price was really good for achieving a gyre flow.
The CP-40 was such a dissapointment. The noise level (especially on the 4th of 4 settings) is driving me insane. The controlability is 4 different programs, with a circular knob that controls the delay between pulses. The worst is the 2nd setting of the on/off pulse. In this setting, how many seconds on = how many seconds off. If you want 3 seconds on, 1 second off, then sorry it doesn't do that. Also, the build quality of the controller + pump is completely inferior to the maxspect. If you can visit an LFS that sells both, I recommend you hold both in your hands, and you will see the difference.
I personally have nothing against the company, in fact I am very happy with their DP-4 and DP-4s dosing pump. But this product was such a bad knock-off!
For the cost of a couple frags, you can get something that will surely make you happy with your upgrade. but that's just my opinion.