I got some of the HGW set. I wanted to use it on the WNW Albie. This product requires a base colour, which is no issue and also you can pre-shade and vary the base tones which helps.
However, I did find that these decals were difficult to work with, ie very thin etc and IMHO the pixellation overpowered the graining effect. So on my Albie I used oils. On a positive note however, the tonal variation isn't too bad, so if we are using these to give the impression of the wood effect where tonal variety can trick the eye, then they may be OK.
I will use the sheet still perhaps on interior wood such as instrument panels etc, or on frames where thickness of paint can be a problem. For exteriors, I would like to try the decals that have some of the more interesting shapes in the flow of the grain, knots etc, which itself is more difficult to do by hand with oils.
I would argue also that even in 1:32 we are only really representing the tree ring patterns in the wood, not the individual grains. In 1:72 these would be barely visible, hence perhaps tonal variations and weathering/finishing can give a reasonable impression of wood?
Each to their own of course