Turtle as someone involved in product development of RF based products I can guarantee you that the FCC issue is not a Red Herring. Without certification testing by a lab, which are certainly available in Europe, the product cannot be imported into the U.S. for commercial sale. Individuals have purchased some of their previous offerings for private use in the U.S., even though operation of any of the wireless portion is still illegal.
If XP were interested in or even capable of setting up a U.S. based operation, they would have developed the new product with U.S. certification in mind. As it stands they appear to have no interest in the U.S. market at this time, though that could change in the future.
As to the merits of the "new" design. I believe that UK Brian in another thread pointed out that the "innovations" are nothing new, they've been done previously by other companies/individuals. What "appears" to have been nicely done(at least in photos), is the industrial design packaging aspect of the product.
However, as someone that works "in the business" I have some reservations about the reliability/practicality of the design. Three separate sets of batteries is never a good thing, coupled with questions like:
1. Are they common off the shelf batteries or special design?
2. Are they all charged in unison?
3. How & where(factory) do they get changed out if they wear out or leak?
4. If they have to be changed out at the factory what's the charge for doing that?
The Achilles heal here is that a problem with any of the three battery packs results in a dead detector.
The wireless aspect is another area of concern, because wireless is never 100% reliable. If you read through the forums you'll notice that EMI is a problem with wired detectors. And there have been some EMI issues with the wireless headphones of the White's V3. That is, the wireless link to the headphones is the incursion point of the EMI, not the detector itself. The new XP design doubles the opportunity for that to occur and could make it very difficult to troubleshoot EMI problems.
I have not really looked closely at all of the aspects or operation of the detector, because as I believe Steve rightly points out, it's a dead matter for those in the U.S..
It may sound like I'm bashing the company or design. I'm not, just looking at it with the critical eye of someone that's involved in looking for failure points in designs. It may sound rather pessimistic, but many an otherwise wonderful product has been thrown on the trash heap because of a singular critical flaw that was not foreseen. Curmudgeons also do serve a purpose!
HH
BarnacleBill