I have owned the Harbeth 30.2 for less then a year, but they they are solidly built. Are they built like tanks like Wilson's? No. However, I damaged my right ear drum and it's very sensitive to high or sharp-pitched sounds/speakers. I did not enjoy listening to the Wilsons (just my opinion!), nor B&Ws. The Harbeth's have a wonderful mid-range and the smooth sound of the tweeter allows me to listen for hours on end. I cannot image them falling apart because they are built in a damp climate and moved to a drier one. Speaking as an amateur woodworker, the wood itself, whether used for speakers or furniture, has to have a low level of moisture before the wood is used or there will be problems very quickly. I cannot imagine any speaker company using high-moisture content wood. Hope this helps.
Quality of construction on some speakers- namely Harbeth
I have been doing, the what I am sure is impossible, looking for a great consencus speaker to try. Because of my tinnitus and some suggestions- I am looking at cloth or other soft tweeters that emphasis mid range. Harbeth and quite a few other BBC sound speakers are highly thought of and seem to fit my needs. While looking at used speakers out there, I couldn't help but notice that besides being a lot of ham handed owners, a lot of these box speakers are coming apart at the the corners and their veneers are cracking. My question is, English moist country made and then living in drier climates doom these to seperating or is it just knocking them over causing it?