We have 6 of those 3+ ceramic/PE plate sets at my PD. 10x12 SC, 10x12 MC, M SAPI, 2 L SAPI sets, and XL SAPI set. I may be slightly off but from what I have gathered, they have a 3M DI-NOC vinyl wrap skin over what apoers to be a single layer of Kevlar spall wrap, Aluminum Oxide ceramic breaker plate, imported from Italy, and a composite backer bonded behind that composed of UHMWPE from DSM or Honeywell, then Kevlar, and then a foam rear pad for comfort and back face mitigation. They don't have face or edge padding for resistance to bumps, but that is why they are so thin and why they are armored to the edges instead of just padding on the edges. The aluminum oxide is more resistant to small bumps creating or expanding small cracks than silicon carbide ceramics, but heavier and less hard/tough so it breaks up a bit more on bullet strikes. The Kevlar rear is a cost cutting measure. The type of layering and forming and skinning they do creates excess matrial at the edges, a few small wrap creases, and looks a little less professional than the expensive plates.
Do I wish they were USA made silicon carbide, 100% HB212, and skinned with Cordura that was as perfectly trimmed as a custom tailored suit? Sure, but then they would cost twice as much. The aluminum oxide, UHMWPE, Kevlar combination is a common price/performance construction in 3+ plate construction, even with expensive brands 50% higher in price. The bonding they do is a combo vacuum, pressure vessel process and IMO not perfect, but it stops the rated threats with less than 44mm back face. AW sells Hoplite shoulder plates under liscense with the same Italian AlumOxide ceramic/UHMWPE/Kevlar/foam type layering with DI-NOC wrap construction (while Hoplite ceramic/PE shoulder plates purchased direct are 100% HB212/UHMWPE behind the Italian ceramic, pressed by LTC and skinned in Cordura) but the AW shoulder plates are less expensive than the direct Hoplite. AW also sells side plates 6x8 of identical layer type construction. The side and shoulder plates, from my research, seem like they stop the rated threats but eventually will fail backface on .308 on multihit. The Hoplite shoulders can withstand 6 rounds and hold up to under 44mm backface, to give an idea of what pure HB212 will do to strengthen a plate. The shoulder plates (not sure about side plates) have thinner ceramic layer than the SAPI/torso plates. The SAPI plates are true to size, light, and comfortable. They are a budget plate and not NIJ rated, but stop the rated threats we were most concerned with. They will stop M855, M193, and 308 for 6 rounds. They will stop the first two rounds of .308 with under 44mm backface. Past that who knows. Essentially your trade off is backface deformation and over speed/weight resistance (such as long action hunting rifle resistance) vs plates that use pure HB212 and/or Silicon Carbide, but they cost MUCH less. You could add an extra mm or two of SiC and cut the backer thickness as much if it was pure HB212 Dyneema and have a plate to handle larger 30-06 to 300 Win Mag power range threats in the same thickness and weight envelope, but that is MUCH more expensive and who knows what the backface would be like for those threats. For our uses, .308 and under threats, even with steel penetrators or mild steel cores, they are the level of protection we need and the AW plates fit our budget. At under an inch, they are not too thick used stand alone.
Hope that gives some insight and helps your decision.