I converted to Vallejo from Humbrol earlier this year, but have reverted to the enamels for undercoating (black, very thinned), boots and shakos (avoids the shiny toe syndrome - the acrylics are too fragile until varnished) and metallics - the coverage of Vallejo silver when thinned is seriously inferior to the Humbrol.
I'm still trying to find a good replacement for the old French blue though, even if the very slight colour variations achieved in my figures while experimenting actually looks quite passable (and probably authentic, given the dyeing processes of the time). I'll address this issue of redcoats when I do my first Swiss battalion.
Mark