Agreed, very similar to the Virtuoso decks. I somewhat prefer the design of the Virts decks, and the Virts decks have the advantage of being "the originals",. rather than "the knockoffs".
However, knockoffs or not, these Isometric decks are fine. Moreover, if you would like to have this type of deck for XCM, the "Isometric" deck is much more likely to be available than the Virts decks. At $11 per deck, plus not-so-reasonable shipping, they seem a little pricey for what they are, but still a lot cheaper than Virts, which those pesky collectors/hoarders/speculators have made expensive and difficult to obtain.
The "Isometric" decks show that there is really nothing stopping anyone from producing decks designed for XCM, with more-or-less standard faces and simple minimalist or geometric backs. Despite the Virts' nonsense about "Adaptive Aesthetics", designing decks like this obviously isn't hard. Of course, other decks, such as the Fat Boy Eats All Day deck, the Fontaine deck, and the plethora of minimalist "casino-style" decks already showed this.
There is no reason, other than print run sizes, why decks like this shouldn't be cheap and available -- cheaper, in fact, than the price the Isometric deck producer wants for them. I don't know why they would be of interest to collectors, though, unless you are a collector on a mission to collect every deck made anywhere in the world by anyone.