They're charging $6000 for parts worth about $3400 so I would suggest just building it yourself, or if you must get it pre-built then choose a reputable PC manufacturer rather than a company which mainly sells desks and chairs. It's also a bad time to be buying a 4090 from anywhere, the 5090 is right around the corner.

For me, I have the time so I will build from scratch

It would be more suitable for those who have no experience in AI setup or those who have no time to build but still want privacy. A good point is that they serve as a local server to access like wifi and integrate Llama and Qwen Code