Mine came in today. I did a comparison with an RA set. Visually identical. Dropped in water, the PBT sank like a stone as expected. Nice, but not woo-hoo.
I will say they are nicer than the NOS "Cherry" Escape key that came at the same time.
Unfortunately my experience with PBT has been with IBM/Lexmark/Unicomp and Imsto, so I (we?) subconsciously equate PBT with "thick and sturdy." These are not that.
I like the keys and I am glad I bought a sample set to see and touch. But I am not going to pay triple over ABS double-shots any time soon.
Just my $.02,
- Ron | samwisekoi