I am a huge fan of BG1/TotSC which I enjoyed much more than BG2/ToB!
And here I am speaking of unmodded version of both games.
The magic with TuTu is that we can improve the first game to make it even better!
And the level of customization is so high that it's almost impossible to fail in this.
I love kits but I understand some people might not want them. Don't install them.
People love (not me particularly but many) high quality banters and interjections. There is BG1 NPC for this which works only on TuTu.
Most people love a cleaner, better graphic engine. This is something that you cannot take away but I believe it's just great...
The game still keeps the feeling of the original thanks also to great auxiliary Mods like TuTuGUI, TuTuSounds. We can have the same, superior music that we get in BG1.
Aigleborgne is working on a great Mod which will boost AI to levels that can't be probably reached by the BG1 engine due to some limitations (although Echon has been great with his FotD!).
The guys working on TuTu and TuTufixes are heroes and put a lot of effort to make it more and more stable and bug free. It will take time but a final result is around the corner.
Plus SimDing0 has announced Virtue for TuTu. I am gonna love that!
So, all in all, I love BG1 original concept. It's just great. It's superior to BG2, no doubt. It's funnier and deeper and more interesting.
But it *is* possible to make it even better, so why not ?
Thanks!
P.S. Icelus' UB will be another great, wonderful addition!