My experience has been like both Banditos and kristalsoldier. I have had an SP1, SP2 and an SP3 all bought on day one. And in all three cases, those machines were not just my tablet, but desktop and laptop...in effect my only "top". And in all three cases, they have been worry free, reliable and a joy to work with. (Truth in advertising, I am not a gamer nor indulge in virtually any graphics work.) I use my Surfi (plural of Surface???) for email, news, research, some podcasts (usually involving Mary Jo, Paul, or both), and, sigh, lots of meetings where I am the note taker or talker. None of the machines have ever failed me.
Are there "issues", hell yes, but they can be mitigated or corrected. Take yesterday for example. When Bandito "vented" I looked carefully at the machine and what it was doing and just as I was looking, it went from Gigabit Ethernet to Wi-Fi on its own, then slowed to a crawl. As I restarted, I noted a box at restart that said errors at a specific location resulting from IE rewriting something. But the screen notification was displayed too quickly for me to capture or memorize. Now, I felt I did have an issue since malware is the first word that came to mind. Then the restart went haywire. Would not restart, then would not start (start button), then did not start until I did a start button/volume down start - twice. Even then the screen flashed (black to dark gray, etc,) three times then went off and just sat there. Windows button did not vibrate, but the touch keyboard stayed lit.
After a few moments, I tried again, and this time the SURFACE logo came on and the circle of dots circled, but only once, then off went the machine again. I tried again, but this time without anything connected (no mouse, no KB, no mDP monitor, no USB3 connections to anything.) It started up, the dots circled twice and the system came up as normal like nothing happened. But I did think the startup was slow, and there were some flashing of the screen, but in 10 seconds all was right with the world.
With all seeming to be running normally, and still thinking malware, I had Vipre scan everything. But no issues were found. I also made sure the patch Tuesday updates were installed ok, they were.
So I shut down normally and waited for a minute or two (I really went to the bathroom, but let's pretend that I was just helping the SP3 forget its woes.) I started up using only the start button and all worked quickly and correctly - though it had forgotten what color the desktop was supposed to be. But no further problems yesterday.
Today all is normal and fast, but the news wasn't all that good (another ebola case in TX), which is not something I can blame on MS or the SP3.
After an hour or two of online work this AM, I manually checked updates and was surprised to see that the 6 Oct firmware update (which was successfully installed on 6 Oct) showed that it reinstalled today and needed a restart. With a bit of trepidation, I restarted. No problems.
So, there are glitches like this in the SP3 (which by the was is totally converted to Win 10), just as there were in the SP1 and SP2. Mostly - for me - they have all had something to do with the Marvell adapter or a peripheral. The machines are quality made and reliable for me. They have never failed me. I will admit that from time to time any computer I have owned has made me learn new anatomically improbable vocabulary AND a bit more about my machine.
I will buy the SP4 on rollout and keep using the SP3 until it dies of old age - that's like two years from now.