I bought a set of JJs before the scarcity of tubes kicked off just in case. Still have not had a reason to switch them out. These don't get much love, but for someone who only uses the clean channel, it is exactly what sound I was looking for.
Although I'm a fan of NOS tubes, when it comes to new manufacture I like JJs best. So I'm with ya on that one. In fact, when I had to travel to other studios with my amps (a practice no one bothers with any more) I used to pack a set of JJs as spares.
Also, the folks who bought the Telefunken name and make very high end mics here in the US (they also have lower priced mics made overseas that are highly regarded) buy their tubes from JJ and then have them cryogenically treated. They could buy from any vendor, but picked JJ.
Cryogenic treatment was developed to stiffen metals in industrial situations; when tubes are cryo-treated I find they tend to have less tube rattle and microphonics, which was a real problem with my Mesa Lone Star 212 combo. A set of the Telefunken 6L6s fixed the tube rattle like magic.
Lately I've been running NOS Siemens tubes in that amp, and there isn't tube rattle, either. But I could easily live with the JJ/Telefunkens.
I generally don't buy used amps because I've always needed everything to work when clients are over to observe my sessions. With tight deadlines, I can't risk a problem that might develop because the previous owner did something to the amp.
The HRD has lots of fans. I like a different type of sound so I don't own one.