I treated myself to one about four years ago. After many years of telling myself it was too expensive.
It was complete crap. I mostly kept it in its original box except for fooling around with it on an rPi. It failed in less than two years.
I sent it back for repair under warranty. The warranty required I pay for shipping it back. Another twenty-five bucks down the drain.
A few weeks later its back. In the interim, I am poking around on the Unicomp website and notice that it lists the weight as...I don't remember, but like five or six pounds.
The one I bought from Unicomp weighed in at just under three. I remembered when the Unicomp arrived and thinking it felt light and flimsy compared to my memory of the original Model M I'd had back in the 1990's (salvaged from a 8580 headed to the dumpster).
I got the replacement back and sell it on eBay to cut my losses.
I bought the Unicomp before the pandemic, so it wasn't a supply chain issue. Just a company maximizing profits. Requiring customers to pay for shipping under warranty is probably a sign that the company knows it will have a lot of warranty repairs.
My advice is don't buy a Unicomp. But YMMV.