Hello Steve,

As PCB supplier Coretec fabricates and delivers quite a bit of this product.  T-lam is the dielectric made by Thermagon and its niche in life is its ability to conduct heat at 10X the rate of FR4.  Those who use it love it; those that don't have a need never use it.  We build standard PCB's that are laminated to heatsinks using the T-lam prepreg.  We also deliver single, double and multilayer boards built with Thermagon dieletrics replacing FR4; all UL approved.
In any case I have never heard one bad thing regarding assembly (or otherwise, save the price).  Pretty big statement, but true.

Boston Brad
781 858 0783