Thanks, Serendipity, for your response about the experience of two hamsters. I actually have space to have cages side by side. On the other hand, I've only ever had one hamster and I'm not sure I'd be ready to have two just yet. Don't know; something to think about.
Interesting that yours get in sync a bit with each other, although it makes sense.
Once again, I'm reminded how individual these little creatures are! There certainly does not seem to be any kind of generic hamster with a predictable personality. Part of their charm, though.
Still planning on getting that cam!