This is an amazing site, only small thing is sometimes adding too many keywords confuses the search. Be as simplistic as possible when using it IE “Omastar PSA Sandstorm”. Things with 's sometimes confuse it as well and occasionally it leaves out a piece of data here or there, but otherwise its an amazing tool!
This is a pretty handy tool if you want a high level look at old sales data, I’ve used it a few times to look up prices on booster boxes (it records things other than just graded/raw cards). I will probably be scraping it to get booster box historical prices on my site once I finish off the other core features, and then using the eBay API to keep it up to date.
It does have very obvious limitations in that all you get is the auction title, date and price along with the search being a bit fiddly sometimes to get the right results. You can’t go view the eBay listing even for the recently finished stuff and the pictures only go back to early 2018, you don’t even get the auction ID to go look up the listing yourself which is sad but I understand why. That said, it certainly has its uses and it’s good if you want to go back and lament over not buying things at prices 10 years ago or find data on a card that doesn’t sell regularly 
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