While I'm quite experimental with BG2, I usually play BG unmodded, so I decided to give UB a whirl.
I played a LN fighter with the following party: Imoen, Ajantis, Kivan, Coran, Yeslick.
Game was patched and the following installed:
~BG1UB/SETUP-BG1UB.TP2~ #0 #1 // The Mysterious Vial
~BG1UB/SETUP-BG1UB.TP2~ #0 #2 // Additional Elminster Encounter
~BG1UB/SETUP-BG1UB.TP2~ #0 #3 // Angelo Notices Shar-teel
~BG1UB/SETUP-BG1UB.TP2~ #0 #4 // Finishable Kagain Caravan Quest
~BG1UB/SETUP-BG1UB.TP2~ #0 #5 // Coran and the Wyverns
~BG1UB/SETUP-BG1UB.TP2~ #0 #6 // Kivan and Tazok
~BG1UB/SETUP-BG1UB.TP2~ #0 #7 // Branwen and Tranzig
~BG1UB/SETUP-BG1UB.TP2~ #0 #9 // Appropriate Albert and Rufie Reward
~BG1UB/SETUP-BG1UB.TP2~ #0 #10 // Place Entar Silvershield in His Home
~BG1UB/SETUP-BG1UB.TP2~ #0 #11 // Scar and the Sashenstar's Daughter
~BG1UB/SETUP-BG1UB.TP2~ #0 #12 // Quoningar, the Cleric
~BG1UB/SETUP-BG1UB.TP2~ #0 #13 // Shilo Chen and the Ogre-Magi
~BG1UB/SETUP-BG1UB.TP2~ #0 #14 // Edie, the Merchant League Applicant
~BG1UB/SETUP-BG1UB.TP2~ #0 #15 // Flaming Fist Mercenary Reinforcements
~BG1UB/SETUP-BG1UB.TP2~ #0 #17 // Creature Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #18 // Creature Name Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #19 // Minor Dialogue Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #20 // Audio Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #21 // Store, Tavern and Inn Fixes and Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #22 // Item Corrections and Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #23 // Area Corrections and Restorations
~BG1UB/SETUP-BG1UB.TP2~ #0 #24 // Permanent Corpses
~BG1UB/SETUP-BG1UB.TP2~ #0 #25 // Elven Charm and Sleep Racial Resistance
~BG1UB/SETUP-BG1UB.TP2~ #0 #26 // The Original Saga Music Playlist Corrections
~BG1UB/SETUP-BG1UB.TP2~ #0 #27 // Sarevok's Diary Corrections
No other mods (not even Tutu - this is the non-Tutu version).
Several of the things worked fine (the vial quest, Quoningar, the Sashenstar's daughter) but a few others didn't seem to happen, or if they did, I missed them. Coran did not comment on the wyverns at all, and as with the unmodded game, kept making comments about having wyverns to kill.
I didn't notice Edie near the Merchant League either, but then I could have just overlooked her (I did not kill Aldeth so I got his quest with the doppelgangers).
I didn't notice Shilo Chen either.
The other thing I'm curious about is the final Tamoko encounter in the Undercity. In my previous (unmodded) game I also played a LN fighter - only difference was that time it was a female, rather than a male as in this game - and was able to talk her out of attacking. This time I couldn't despite telling her she wasn't my enemy and not to throw her life away. Anyone know if this is down to UB, or something silly like only women can talk her out of fighting? (Just curious, really).