I had Mac’s most recent solid state preamp and actually preferred the $599 Topping A90D in terms of sound quality. The Topping had a significantly lower noise floor and just overall superior resolution. Of course the Mac felt and operated like a more premium product and has a good built-in DAC.
The other times I’ve experienced Mac gear I was never blown away, but in those systems I couldn’t really isolate what was contributing what. Most of those systems were rather laidback and mellow sounding which aligns with the general consensus of the Mac sound. The best systems I’ve encountered have not happened to have any Mac gear in the chain.
My overall impression is that much of what one pays for with the brand is the name and legacy.
As for resale value, it seems some pieces simply hold their value better than others. I had to take a substantial hit on the resale value of the Mac preamp even despite the fact I bought it used for thousands less than retail.