If I've correctly ascertained who Vendor X is, my experience has been good through four purchases and one warranty repair job over two years. They very helpfully arranged an urgent delivery in between Christmas and New Year two years ago. At one stage I was provided with a phone number so we could keep in close contact around an issue. My most recent experience was a purchase mid 2008 which went well.
At the same time, our expectations are high these days, particularly when we are enthusiastic to move ahead on a purchase of what should be in-stock items. The vendor who can meet all the expectations of all prospective customers will do well. I suspect such a vendor does not exist. It's always a balancing act, particularly in a low volume market such as Australia. For the best prices, maybe there is no shopfront or staff on immediate call. I do go to Ebay for items and have to balance a very low price against the risk of an unknown vendor in Australia or overseas where I cannot go and inspect product or pick it up when I part with my hard-earned.
I've walked away from vendors who don't respond in my timeframe, regardless of the reason. Other times I've stayed the distance for the particular product or price.
Hope that you are soon a satisfied customer, Phil, whether of Vendor X or another. The joy of owning and using a product soon outweighs the frustrations of getting it in the first place is what I have observed.