I went from a 661 suit to a Leatt 3DF suit.
The Leatt suit material is much tighter fitting, and more comfortable. It's almost a 2 person job to get off at the end of the ride, after becoming sweated onto your body...
The front and rear pads on the 3DF are ~ 20mm thick, and are very tough. As strong, if not better than the 661 plastic tiles.
The arm and shoulder pads are thinner, I felt they weren't as good as the hard plastic on the 661.
Luckily, I never had to test it out too excessively. However, the first time I wore it was at the 2012? Desert Storm, NZ folks will know what that is, when it was run in the winter, and was a bog for 100k. At some point I got jabbed in the chest, because there was a mark and a tear on the suit, but I don't even recall it happening.
Would I recommend it, yes, I considered and tried all the non-suit armours at the time before going with the 3DF.
With the Omega brace, you'll probably have to mess around getting it to fit, maybe look into cutting the rear back armour. All the pads are removable from the material 'shirt', so its easy enough to do.