The tour was ok, and the tour guide was nice - she was quite chatty and spoke English well. Spent quite a lot of the time talking to the driver instead of us but the drive to Alexandria isn't particuarly interesting so perhaps she didn't have anything to comment on.
She took us to the catacombs which were cool - be warned though, there are a lot of steps down to them! It was quite mindblowing that there is paint that still exists after all this time.
The citadel was beautiful but as we were left to walk around ourselves, without any sort of commentary, we felt like we'd missed the important factor of it being one of the wonders of the world!
Pompey's pillar was quite random really and didn't particuarly interest us.
The library is impressive but it's just that...a library. Without actually using it for study, just walking around it was pretty boring. The interactive things were cool but not necessarily something I'd travel 2 hours to see!
Lunch was nice, in a nice beachside setting but not really very impressive - it was just a buffet lunch with some bbq'd meat which took a long time to arrive.
It's a few hours drive to get to Alexandria from Cairo and I'm not sure that I'd consider the things at the end of the trip worth it.