I am renovated my entire main floor. We bought a character home with site-finished hardwood floors in the entrance and office. We wanted to do hardwood throughout the main-level. We decided to go with site finished floors because we LOVED the original look of the site-finished hardwood.
I read A LOT about site-finish vs pre-finished. The truth is, the only reason people tell you to go with refinished is because they make more money selling you the wood. If you have a really good installer like Mark at Parkland, you don't have to worry. The quality of the sealers now a days are amazing and besides, the original floors were 40 years old and because they were site-finished they were still in perfect condition in the entrance.
Since we had left he office, Mark refinished it and stained it all the same colour an it looks so amazing. I really can not believe how awesome it looks!!!!