For anyone considering these devices, the only reason I would recommend against them is if you plan on getting multiple to link together - the DGX Spark has a much, much faster interconnect bandwidth ceiling than the AMD devices do.
Microcenter has them marked at $4500 right now (that's with the 4TB SSD) [1]. I suspect it comes down to what you're using it for; if you're looking for a general purpose computer that's also solid at AI, the AMD machine is better. But if you want the best possible AI machine at below $5k... actually you should probably just buy an RTX 3090 or 5090. But if the 128gb of memory is critical, then yeah DGX Spark is it.
For anyone considering these devices, the only reason I would recommend against them is if you plan on getting multiple to link together - the DGX Spark has a much, much faster interconnect bandwidth ceiling than the AMD devices do.
Otherwise, they're great!