I upgraded on the release date, Edge is a big improvement over IE both in speed and function.
The only issue I have had so far is with the mail app, I don't send much e-mail so it not really a biggie, it's a known problem when they will fix it, hard to say.
The rub is this, if you like me have multiple emails and those emails are all linked to MS, which all mine were (keep all the mail in one basket thinking).
Then what happens since the mail app uses your MS email as your primary login and security check point, is it does not allow you to "select" which email the mail app uses and you can't change it, mine picked my ISP email (as the send default) which I never use and have never used for anything other than to speak to them, it is my most private email.
Now here is the deal, all my mail comes in fine to the mail app as my main MS email account can be managed from the web, the problem is sending I can't use the mail app to send emails as it wants to use the email it picked as the default and will not let me change it (i guess a security issue), I can go online and use the web mail then all works fine.
Why they won't let you change that I do not know other than the security tie in, which is likely why they won't just tell you how to do it yourself but instead make you get tech support involved.
The funny part if you select the update account option inside the app, it sends you to the web lmao, where all is correct, it's a damned-able catch-22.
Other than that I have found no oddness and it all seems to work very well, the upgrade itself was quite painless and it did not mess up any of my settings or installed programs. Now I was running the very latest Win8 as this computer, it is very new, only a few months old and was intended to be upgraded to Win10, can't say that would be the case for all systems especially older ones you know how compatibility support is...
I did manage to uninstall the mail app (not suppose to be possible and has to be done via the command line) however when it re-installed it set itself right back up the way it was, some had suggested this might resolve the issue, it don't so don't waste time on it if this happens to you.
Supposedly MS Tech support can fix it via remote access, you have to get in the queue for that and be available when they call, whenever that happens to be, they only call once so if you miss it and there will be no notice then you must start over, not a big enough deal for me to do that.
If you have only one email with MS and no others linked in then this will never happen, other family who are like that have had no issue with the mail app, it's just the guys like me who have multiple accounts linked into MS.
I suspect if I were to remove all the linked in accounts and leave only my main account active, then remove the mail app and re-install it that it would be correct, that is far too much work as then I'd have to go back and set them all up again, would be quite the pain and is just not worth the effort so I'll just pop into web mail when I need to send one.