I just installed the new software and tested it for 5 minutes. Initial impressions:

installation had no problems
noticebly faster app loads
noticably less memory warnings (for example, I loaded 2 large web pages, ESPN and FoxNews) while playing streaming radio and had no problems at all, where before just the ESPN page alone would give me low memory errors.)
noticably faster switching between apps

Overall, a definite improvement. If this keeps up, I'll be happy!