My limited experience with XP and their inventory problems tell me that they either can't keep up with demand, or distributors are too few and far between. I bought an ORX used on ebay last fall. It came with the 9.5x5"elliptical HF coil. I loved it. I enjoyed the ORX and loved the HF elliptical coil. The ORX was finding large coppers in areas that had been hammered by Equinox and Garrett machines.
Once I got the ORX down, I began to feel it's limitations and looked into the Deus. I bought the Deus for myself for Christmas, and started looking for the 9" round HF coil in the U.S. after hearing how well it performed. I had NO luck finding one until mid March. I contacted XP in France a few times and they assured me that a shipment was due to arrive in the US in March, which it did. Here in Massachusetts there is a dealer/distributor that I set up a pre-order with, and waited from mid January until mid March. I finally got the 9" round HF coil. Meanwhile, I had no trouble finding the 9" and 11" X35 coils, which I bought. Now I have four coils. Two HF and two X35 coils. Honestly, I only use the HF coils, and the elliptical more than the round.
XP seems to either underestimate their popularity, or sales, or both... or they just can't make them fast enough to keep up. I honestly don't know. All I do know is there seems to be varying limited supplies of almost all their equipment, for whatever reason. Thankfully I now have everything I need and want from XP. It didn't come easy, and I think it should have. I don't see other manufacturers falling as far behind as them, but I honestly don't keep tabs on all the stuff out there.
As far as supporting their HF coils, I don't see that as a problem, as the HF coils are on the top of everyone's list of wanted items. The HF coils are their bread and butter right now, and I don't see that changing anytime soon. I brought my Equinox 800 to a permission many times last fall, as well as a Garrett AT Max. I brought the Deus to this place last week with the HF elliptical, and it felt like the place had never been detected before. It was't a little bit better, it was a LOT better, and I found a multitude of items that the other detectors never picked up on. I do love the Deus, and the HF coils.