I updated last weekend. I use Safari a lot and haven't had any issues. The weird thing I experienced during the upgrade is my iPad (3rd gen) got 1 Gb of memory freed - in that section iTunes calls Application Data. Still, 1 Gb is 1 Gb and I'm glad to get it back. And no, I haven't noticed anything amiss. The memory footprint on my iPhone remained the same.
As far as maps goes, I don't use maps much (either Google or Apple). When I really need a map for long distance trips I use my Garmin. My experience with the mobile map apps so far is they're junk compared to the Garmin. I do need to do some traveling this Monday so I'll have the opportunity to do a side-by-side comparison test.
Had the opportunity to seriously use Apple maps yesterday for the first time. I liked it better than my Garmin (which is a 2008 model). I like that it gives you street names for turning and that it tells you of upcoming turns and exits well in advance. The fact that it cuts in over the music being played by my iPhone is a practical plus - the Garmin simply can't do that. Finally, a plus for pointing out hotels and gas stations. My Garmin definitely didn't do that either.
As far as maps goes, I don't use maps much (either Google or Apple). When I really need a map for long distance trips I use my Garmin. My experience with the mobile map apps so far is they're junk compared to the Garmin. I do need to do some traveling this Monday so I'll have the opportunity to do a side-by-side comparison test.