I have used them, they work fine, but like any very high GBP device layout is critical, and even then these things will oscillate at low level in the absence of input signal (It goes away as soon as any real input power is present).
Note the phase detector is least accurate around the in phase positions, better to arrange for the inputs to be slightly out of phase when whatever condition is critical for you appears.
You want at least a two layer board with solid ground plane, and 4 layers is better...
Regards, Dan.