I use COMC primarily to fill out modern Topps insert sets as I build master sets. Almost always they have the cards I need - unlike Beckett, I can buy from multiple individuals and pay just one shipping fee. I also use them for variations as there is never any doubt that the card you're buying is the card you will receive.
Recently, because of some prior comments on this very thread, I used them to help complete my 1967 Topps set - I was able to find a number of very nice cards at what were very good prices.
The single drawback, as many have noted, is the shipping time. But hey, it's gotten much better than it was at the height of COVID, plus I also buy regularly from Greg Morris and sometimes it seems like he sends them east via pony express, so...(this is NOT a slam against GMC!)
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