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I love my 2012 QC i7. Runs Mojave like a champ with two internal SSDs. One word of caution... mine (eBay 2016) came with the original fusion drive. The drive started giving I/o errors and I was lucky to be taking regular backups. I forget how apple determine the hd was the cause, but it wasn't obvious. Regardless, I would say consider swapping at least one real SSD in there - and enjoy!
 
It will probably not be supported by the successor of Catalina. So, I'd try not to overpay.

I've got a 2012 i7 myself, but I'll wait until 10.15.1 at least. There's also the issue of the removal of Dashboard....
Without an SSD, they're not fun, though.
 
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