Great site for finding lamps, rugs, accessories, side chairs. Items are well packed, and the one time I had to contact a CSR, I received a prompt answer that solved my problem (chair legs were zipped inside the underside of the chair. I never would have thought to look there!)
However, after experiencing a Gotta Have It moment following an HGTV show they sponsor, I ordered a large sideboard. Delivery company changed the delivery schedule twice, including late the evening before delivery. They showed up hours before the revised time they'd emailed me, and left a mirrored sideboard ON END on my porch, even though it was clearly marked fragile, glass, and this (other) end up. Color of sideboard was also off from what was pictured on website. (BTW, don't tell me it's monitor settings: I viewed it on several computers, and a phone, while I tussled with myself about placing the order), plus it was featured prominently on the TV show, where it was a much brighter, glossier color. (The TV show referred you to their site to find items contestants had used, and J&M would email you a link before the show ended to find them, too.)
To add insult to injury, a couple of days after delivery, I discovered the exact same item for almost $300 less on their parent site, Wayfair. Joss and Main is supposed to be a flash sale site, but the Wayfair had a far better deal. From now on, I will search Wayside prior to purchasing on J&M. TIP: The item names are different, but search keywords from the descriptions and you'll find the item if it's on the other site.
I would not hesitate to use J&M for small items that can be delivered easily via Fedex and the like, but for larger items requiring truck delivery, no way would I do it again unless I could specify any other delivery company than the one they used. And items this large are virtually impossible to return if you don't like them. It's kind of a "learn to love them" moment.