Former Jaydee owner here.
I actually swapped a Wal Custom for a beautiful Supernatural back in 87. I loved the legendary Wal pre but just couldn't live with the significant weight, playability and clunky ergonomics.
I loved everything about the Jaydee apart from the weak output/pre. Sadly, I was one of the unlucky ones and in time the neck developed a terminal backbow which would have suited better as a weapon of Robin Hoods choice! Suffice to say I was gutted.
I'm over it now, and as my favourite looking basses I often keep my eyes peeled for a 2nd hand one (rocking horse poo).
That said, the new prices must make them one of the best custom bass build options available.