I just demo’d a pair this morning. (You can too by the way, either come in and demo on your bike or have them shipped to try.)
Personally I was surpirsed by how well I liked them. I don’t know what your racing/riding goals are either, so…
The PBO spokes are actually strands of fibers that have a greater tension than most wheels. The spokes cause the wheel to be stiff both in reaction to the road and laterally. However, the PBOs absorb an incredible amount of vibration. Add to this that the rim section is fairly aero at a depth of 43mm and a stated weight of 1620g (Zipp 404 - 1685g) and it’s a great all around riding and training wheel.
As far a tri-bike racing wheel, I’m not going to endorse them, but they make work out well depending on your budget and course.
Cheers!