Advice on trustworthy audio resellers who check condition, offer trial period?


I'm wondering what resellers you find reputable for your purchasing. I've made three purchases with Tmraudio.com (The Music Room) in Colorado and they've been great. They guarantee their items work, have a 14 day trial period, and an easy to navigate website.

What other sites do you know of like this — not just that connect sellers and buyers, but that take in used gear, test it, rate its cosmetic condition, and offer a trial period? (I'm a bit wary of buying, say, an amplifier of $2k only to find it's not what it's supposed to be.)

This could be a general site, like The Music Room, or just a store that does this (good selection, prices, trustworthy, and trial period). Thoughts?

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@richopp Thanks for that tidbit. I'd add this: I ordered some Sennheiser headphones from TMR as a gift. The case has some discoloration on it and I asked for some compensation; without argument, they credited me $10. No argument, just did it. I know that's not a big deal, but the lack of debate/agitation about even small things does a lot to keep me sweet on a retailer.
Echo is the best place I've found.  More than once Kurt has talked me out of buying things because they might have only been a sideways move from the component I was considering replacing, not a good fit with my other components, etc.  

I have had a couple of instances where there were issues, one when a used cartridge arrived with no diamond on the stylus, they gave me a full refund and another where a vintage automatic turntable wasn't returning correctly, they fixed it right away and I still have it and it works perfectly. 

It's such a great place, that I almost hate to mention it because I often see things show up on their website that I want and someone else has already snatched it up.  Their prices are close to unbeatable.

TMR is great too, I've had good experiences with them, including when I purchased a preamp that showed up with some broken capacitors.  They paid to have it returned and repaired it quickly.