Had a few rough days where the read/write speeds were absolutely awful. Trying to transfer 3GB into an external SSD was taking 3 hours! But then after some research I found out the issue was usually related to restoring Intel Macs from a backup into an M series Mac. After I reset it and started from scratch, the machine is FLAWLESS. No complaints at all. One minor observation is that the ports all seem a bit flimsy? The cables all seem to move around a bit more than my last MBP, and the HDMI seems to be the one most noticeable. But no issues with losing connection, so all good.
Super happy with the purchase, especially after retuning it for an Open Box in perfect new condition, and then getting another $200 in price adjustment after the sale. Xmas in August!