Hi, I live in the Denver area, so I can pick up and drop off my items at their location in nearby Erie, CO. I save a ton on shipping, particularly if the item is heavy.
So far, I have sold to TMR: two preamps (ARC and Mytek), three sets of mono amplifiers (PS Audio, Boulder, Clayton), a stereo amplifier (Spectron), a pair of speakers (Thiel), an FM tuner (Magnum Dynalab), a DAC (PS Audio), and a headphone amplifier/preamp (Pass Labs).
So far, I have purchased from TMR: Internet Media Tuner (Magnum Dynalab), a DAC (Chord), a streamer (EMM Labs), and a preamp (Audio Research), and several sets of RCA interconnects (Audio Quest, Cardas).
Thinking back over these 15+ transactions, I have only had two issues: The 30 year old Thiel speakers that I sold had a minor age issue with the tweeter surround. A replacement pair was sourced from Coherent Source Service (+1 to Thiel owners group) and TMR installed them before they were sold on to a new user. We agreed on the price/cost in advance and we both were satisfied. The second issue was a partially defective digital output on the MD internet media tuner that I discovered after purchase. (TMR offered to fix it, but I chose to re-negotiate a lower purchase price). Again, win-win.
So, I am a committed repeat customer of TMR. I recognize that I might get less in trade, or pay more for a purchase, but it is worth it to have transactions that are safe and hassle free. BTW, I have been scammed on audio gear in the past, so a safe transaction is something that I recognize has value for me.
I still will selectively buy audio gear from other sources, but I either want to see it in person, or really vet the seller.
YMMV.