Finally decided to pull the trigger on the SP4. Picked up an I5-256-8 yesterday at the Microsoft Store. So, first impression, I really liked it. Loved the screen, liked the form factor. Continuing to setup some items, and we get to the problems. Added my gmail account to Mail, click on the account, Mail crashes. Peruse the web, one fix says "Run the store App, click on your account icon, select update" to presumably update/refresh the system apps. Store App immediately crashes upon selecting update. Sooo, then notice that a number of updates are pending including a firmware update. (Why not force these updates when you first start up on the brand new machine?) So run all the updates, reboot, check update again, and there are a group of what appear to be smaller updates that flash by quickly. Restarted, same thing. So a group of updates that won't install. Oh well, check Mail App - insta crash. Check Store App - insta crash on update as before. Ok, figure I made a mistake by not updating first. Next, do a Reset. After the long long time this takes, I go back in and run the updates again. After the updates finish and after rebooting, I run update again. Same thing with the small group of updates that run over and over again. Well, at least reset should have fixed the App issue. Nope, exact same behavior. Ok, lets do another Reset, this one with the full delete, and after grinding away for a couple of hours get a popup that says it will reset and/or remove any keys, etc. Sure, I don't care, maybe that was the issue. Again ran the update process, and no joy. Exact same thing, group of updates that keep running every time you check, Mail App crashes, Store App crashes on selecting update. Now I am retired from Microsoft, and at one time was a QA manager there in the product group. I am astonished that a product as important as the SP4 gets out the door in this condition. It was made in January so it is not a real early model and you would think some of these bugs would have been dealt with. Thus, this morning took it back to the Microsoft Store for a full refund. Bums me out, because I really liked and wanted the SP4 form factor, and wanted to get away more from my desktop. I guess I will wait until I can be reasonably certain that there are machines in the pipeline that have the requisite engineering and firmware changes along with fixes to Windows 10, particularly the flaky App model. In the meantime, have ordered the Pro update to my iPad Air 2, and will have to use the smaller form factor for drawing instead of the much nicer SP4 Pro screen. C'mon Microsoft, this really disappoints me.