The 105 components he swapped out are definitely better that what you originally paid for. And 30 gears versus the 27 you were otherwise going to get is not that big of a difference. More is generally better. Do you happen to know the spread on the cassette that he ended up using?
Sounds like a nice bike! Enjoy!
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher