When I tried 2.5 Beta, I actually thought I would like it (minus the Facebook linking, etc). Once I actually downloaded it and tried to use it on a normal basis.... I ended up quickly switching back to 2.4.
Issue #1 : I lag like crazy in 2.5. After just purchasing a brand new HP Envy laptop, I've been able to walk around normally in 2.4 with graphics at Ultra AND shadows enabled without a single issue. However, in 2.5, not only do I lag everywhere, but if I turn shadows on for a while to do photos... it tends to overheat my laptop and even force a shut down. Fail.
Issue #2 : I did like the new profiles... for a while. Then they just because a nuisance for me. Its nice that they still (albeit half-assed) show up in sidebar, however I wish we could keep ALL of the profile in the sidebar, but give the option to pop it out into a web browser. Seems as tho the first "2nd Life" page is "web only", however the "Picks" section is still readily available. Strange to me. Plus it pops up over my playing screen, I keep having to minimize it because it covers everything and doesn't stay out of the way... but I think thats just me. LOL
Issue #3 : I read in a previous comment that others are having this issue too.... I go to open someones profile and MINE pops up. This bug needs to be fixed, its just flat out annoying.
Issue #4 : I like the check box to make your profile NOT shown on the web AT ALL but stil shown in Second Life to either everyone, friends, etc.... however, I'm not sure if this Facebook widget thing still works or not or how they plan on implementing it from getting "Liked" even if someone else lets their information known. Plus it seems as tho the settings don't stick? I've clicked "Save" but I'm extremely weary on profiles even being shown on the internet. I know that before they still were on SL.com's search, but nothing was linked to other websites such as Facebook. Its nice they gave us the option to not have it searched, but honestly... JUST GET RID OF IT!!
I won't be upgrading from 2.4 unless some things are either fixed or just taken out completely because it was nothing but an annoyance for me. :\