They are about as different as can get: the Turbine Pro (and turbine) are closed inner ear monitors while the FAD are open - very open.
There are a lot of differences: firstly, bass response. In the FAD, bas response is curtailed to about 60Hz or so even with EQ, so extremely low vibrations are pretty quiet while the Monster goes pretty far down with lots of resolution.
The Monster Turbine Pro is more of a traditional listen: if you like Westone, UE, and Senn, you will find something immediately friendly about the Monster accept that the MTP have several points in which they are made better.
However, the MTP don't exhibit the one trait which makes the FAD a memorable earphone: the sound of metal. I just don't hear it. Whether with echo or decay, the MTP is quite typical, but that means it is perfectly fine.
I prefer the FAD to a lot of other earphones, but then as noticed by both DFKT, James, and the other guy (me), it doesn't meet all genres with the same respect. Before I got to part with these, I've been picking various songs, EQ's, and amps to see what is best.
I still think a loudness curve works best, but bass may only need around 5-6 Decibels. The problem is that if your DAP or source already suffers bass roll off, you won't have any bass with the FAD.
I love them, but they take work. The cable is (sad), the sound is extraordinary (if you are willing to fiddle). But it isn't a fun earphone to use: it's heavy, unwieldy, and doesn't work outside very well. FAD are working on a new earphone (got communication from them last week regarding this).
I hope they do.
Monster certainly listened to complaints from people like me and they fixed them (for the most part).
But, no matter what FAD do, they will not change the fact that the 1601 is hardly a portable earphone! It is like a tiny full size with absolutely amazing echo, stage, and layering (minus a bit of smear with fast music) if you are dedicated. I am not sure if they would suite your style or not.
They are not compatible to review on the same lines: Monster are attacking the price/performance angle in all aspects while FAD are attacking one thing: sound while pretty much missing a few important steps in the mean time.