I just took 30 minutes to set up my newly arrived M4 Mac Mini Pro (including migration time from a Crucial X9 TM drive) used on my previous M2 Mac mini Pro, also running Sequoia. The new mini ships with a custom build of Sequoia v15 and one will need to apply a v15.1 software update.
The new M4 mini is smaller than the pictures would suggest, and there is no clearance to insert a finger beneath it to access the power button on the bottom. One either needs to place the unit on its side with the power button conveniently accessible or be prepared to tilt it upward each time to power it on. This is a void waiting to be filled so someone on Ebay will be offering a rocker switch to work the problem.
Because the fan is on the bottom of the unit, that nixes the older Wi-Fi antenna location, and although this unit still hunts transmission (Tx) on Wi-Fi connections, it returns more frequently to the 1200 - 1400 Mbps range with a 5Ghz/160Mhz Wi-Fi 6 connection. The Broadcom BCM 4388C2 radio seems faster overall and may be better suited to work with the Synology RT6600ax router in the other room. This is also evident when screen sharing my 2020 Core i7 iMac over that Wi-Fi connection. A Windows 11 Pro Parallels (20.1) guest seems far more interactively fast than with my M2 mini. Same story with the Ubuntu 24.04.1 guest.
This 14-core, 20 GPU M4 Pro chip solves the Pages v14.2 launching lag, but not that of Word v16.90.2 which is still lethargic. Safari 18.1, Firefox 132.0.1, and Brave 1.71.123 all launch immediately.