So, has anybody upgraded to this version? Can you see any impact on your search results or download speeds?

No difference in search results for me. Speeds (u/l & d/l) seem to jump around more than older versions but aren't better.

Other people might like it a lot more.

The changelog at http://www.limewire.com/english/cont..._history.shtml shows that most of the recent changes are minor bugfixes and mostly work on the spam filter.

So there shouldn't be anything that affects the speeds of downloads, but lots that affect search results.