This is one of the most important issues I have studied extensively before I decided to go the Vandersteen way. This is especially true, the cost components in a speaker design, and I had read some fascinating debates when Stereophile put the Wilsons in the highest pedestal and the Vandys much lower.
I remember an old interview session of Richard Vandersteen where he had categorically put his views on this subject, especially when questioned about his extensive use of grill cloth and little wood in his speaker designs like the 2Ce, 3A and Quattro, and even the subs, center and surrounds. RV claims that about 60% of the cost of a speaker goes for the woodwork and therefore, with his designs, he is able to maximise the money being spent on the drivers and electronics. No wonder he sells such performance speakers in our affordable range. The 5A is a cost-no-bar design where wood is used to make the inert housing around the bass drivers. When people demanded the Quattro in wood, he decided to give it a try but finally found that the wood version did not match the cloth version. So the wood version carries even upgraded drivers, some of them used in the 5A, to match the cloth versions' performance. Even my good friends in some other forums using the Vandys unambiguously tell me that there is not any significant difference between the cloth and wood versions of Quattro as far as the performance is concerned.
Just my 2 cents, please.
Thanks and cheers.
murali