Ive only tried them once.
I also thought it was stale when I used it.
I bought my Silvia from them a few years back and they included 500g or a kilo of their coffee gratis.
I saw it come from the wall of coffee, so it was the same stuff they were selling everyone else. They seemed to be doing a good amount of business, so I thought I would try it when I got the machine going.
I had been roasting my own for a while at that point and had been pretty happy with the results.
When I got the machine going, I dialed in with my coffee so I could compare the old machine taste to the new. After we had done a couple with my coffee, I dialed in theirs. Made 2 flat whites, extraction times were good, shots looked OK but not great, taste was disappointing.