malberttoo, I'm very glad you are stable and running smoothly, but not everyone is unfortunately.
There are severe throttling/thermal issues, some users even reporting their SP3's shutting down due to overheating while simply running Windows Update. It's a proven fact the SP3 is slower than the SP2 when the CPU is actually loaded due to the weaker thermal solution of this design.
My machine can't connect to Wifi after any sort of sleep or hibernate, requiring a reboot or reset of the Wifi card, thus not only eliminating any sort of "Connected Standby" gain but requiring more time when accounting for the reboot.
My machine (others reporting the same) will get stuck at ~20% CPU "System/System Interrupts" usage when a mSD card is inserted and used, thus killing the battery and heating the device uncomfortably. This was fixed on the SP2, but is shockingly back on the SP3!
Other users are reporting terrible results with the N-trig pen and can't even draw a straight line on the screen without terrible interference/jitters, thus eliminating this as an option for artists like previous versions.
Having said all this, I do 100% support the platform, and have owned a SP1/SP2 and now SP3 since release day. What I've learned during this time is Microsoft surprisingly builds very good hardware, but their drivers/software lags behind, as backwards as that sounds considering Microsoft is a mainly a software company...