I initially brought my new antenna into work to show another Ham. He wasn't in that day, but my antenna started a discussion with my co-workers. That also lead to tracking my first satellite. After listening to a few passes, I realized there was no way I could track a satellite, tune the radio, and write down contact info at the same time. I was tracking the satellites with a piece of software on my iPhone already, so I started using the Voice Memo to record the QSOs. Now I have successfully worked nearly 30 QSOs, across 4 satellites. I have yet to be able to use SO-67 yet, as it is in testing. As for the ISS, I have only locked onto it to listen to the APRS packets, no QSOs, yet.
Here is a list of my contacts I have made. I will get some QSL Cards ordered and start sending them out.
In my limited experience, AO-51 (Echo) is easy to use, but many users. AO-27 is not as heavily used, and easier to track across the sky, as it seems to transmit with a bit more power. SO-50 is more diffucult, as it doesn't transmit a carrier when nobody is transmitting, and it can be a little weak.
Hope to catch you on one of my "Sat Breaks", as opposed to "Smoke Breaks".