Haven't tried it but I'm of the same mindset.
Synthetic sucks less when it is wet out and it's cheaper. Those two facts offset the weight and durability issues
Down is lighter, warmer and will last decades but you generally pay for it.
Combining the two limits your replacement options. Once the synthetic wears out you're left with nothing more than a normal down jacket that's less warm for the weight. This applies to ally hybrid designs, whether special insulation mixture like the BD jacket mentioned, or "strategic" panelling like Arc'Teryx's down jackets.
The only time they make sense is if you're a professional and wear out your gear in a season or two through hard use no matter what. In that case the face fabrics are probably more likely to see damage before the insulation itself. Most people are fortunate enough to live that lifestyle though.