I'm in the UK and I've bought several things from other countries outside the EU, including an iBassi D1. I've only been caught twice in maybe ten consignments, and was not even charged for a DarkVoice amplifier that arrived in a huge wooden crate. To the person who says it doesn't matter who you buy from, it just depends on whether you are caught, I do suspect that some suppliers are better at declaring the consignment in a way that reduces the chance of it being caught, and also different couriers may differ in the chances of picking your consignment for tax. To anyone who suggests asking the shipper to declare a value lower than the real value; if ever there's an insurance claim, I think it would be the declared value that would be used.
One item I was charged for was a second hand RSA amp, and it made it more expensive than a new one without charges would have been. I suspect that the seller, who had never shipped abroad before, made a 'naive' declaration that cried out to be charged. I have heard that RSA are quite good at shipping things in ways that don't often incur charges. I don't know if that's true.
In the case of iBasso, my first D1 was faulty and I shipped it back and they sent a replacement. They were excellent, they shipped the replacement before receiving the returned item. All that happened without me being caught for charges.