I've built a few of their kits, the P.75 and Brigand among others, and as said they are definitely not shake and bake and require a level of skill and patience.
However I recently got their new tool Bristol Bombay and have started it. They do seem to have improved over their earlier kits. A better fit and it is going ok at the moment - touching wood.
Most companies improve with time (witness AZ and RS who improved their quality very quickly IMHO) but Valom seem to have taken a little longer then most