I tell you may bad experience then!
I was playing with Mavericks last Friday and start trying and dl some rss readers.
First was nice. but after adding one link to a site, told me: " pay yo have more..." Great!
Then another one that looked worst than the ones of the 90s...
In the meantime I was dling the updates for iLife to see the changes and try iMovie, but they were gigas to dl.
So I left the App Store open and changed room while downloading, after an hour came back and iPhoto was ok but iMovie not and dl very very slow, so stopped and resumed, the Store asked me again the pwd, ok typed in.
So I decided to try and another reader while controlling the iMovie dl, but was to complicated to transfer the very well organized folder I have on my Safari 5.1 bookm bar. Left again the Mac to do a couple of calls and back, I decide to try the menu bar one so the Store asked for the pwd again, typed in.
Checked this one looked better but not as good as the one that was asking me to pay for more, so left the checking as the free ones were mainly those ones.
Yesterday I received an mail from App Store charging me for one of the reader that is not even the better one available.
I might have typed the pwd thinking that it was asking me again after a idle time, I don't know, certainly I'll never use Safari 7 made for quick heads but with less brain...
As somebody said in this thread why upgrading if it get worst? I'll leave it for the poor nerds out there...