My experience with Periapt was tepid. I had reached out to them to ask if they could build me a cable for my first generation (version 1) HE-560s with the mini coax connectors. I was instructed to order the type 2 cable (advertised as 2.5mm) terminated with 4pin XLR. Given I was quite clear in my description of what I needed I proceeded believing that the instructions were a means to get the correct pricing in place and that Periapt were going to add the coax as requested. I thought it prudent to remind in the order notes that this cable was meant for the first gen HE-560's with twist on mini coax connectors. A few weeks later I received a well built cable with 2.5mm ends! I reached out to them to let them know of their mistake and received a message with an apology and a request to "allow us to attempt to resolve this issue and further figure out how exactly this happened". It was pretty black and white on my part ... they did not read or chose to ignore my instructions. Worse they highlighted the instructions on the invoice printed it off and included it in the package. After not getting back to me quickly I decided to open a complaint with PayPal to formalise my grievance and to ensure a full refund. I communicated to them that I wished to return the cable and receive the one I had ordered. Within an hour, Preiapt gave me a second apology and refunded my money. I sent two additional emails letting them know that the refund was my second choice and that I still wanted to return the cable and get the one I ordered. Crickets ... no response from Periapt in over two weeks.
The cable they sent is on sale ... and I ordered a new one from a competitor.
No loss I suppose. Except I will likely not order from them again nor will I endorse the company.
I've actually just been emailing back and forth with some one from Periapt about getting a cable for my HD6XX with a 2.5mm balance plug and a custom cable colour. Now that I read your experience I'm second guessing going through with the purchase. I can get the cable I want from a UK company named CustomCans but it would cost about twice as much money including shipping to Canada.