i have one. and it's PCIe.
channel strip and bus compressor sound beautiful indeed!!!
you have some comparison files between them and waves SSL plugs on gearslutz. plus tons of comments

but as ermz says they are going native which pisses me off as well... but they promised native plugs of corresponding value for all existing hardware users.
and can you also stick with hardware if you want. v3.5.2 works perfect on all platforms. but if you choose to go native you are losing support for your hardware.
all I can say is that i'm very pleased with the plugs and that I will make up my mind on whether to go native once plugs are released.