After a month of riding with them I had some more thoughts.
First let me mention that I don't need a vest, my jacket is super warm,
only my arms ever get a bit cold, and over heating the hands slightly
warms the arms just fine.
As far as not being cabled to the bike, I am starting to enjoy being able
to heat my hands while walking around, especially after a ride for a minute
or so to let the heat soak in.
The battery pack is working fine, I get almost an hour at full heat.
And twice that at 30% setting. More than enough for my commute.
My idea of enough, is to only need to charge once a day (takes about 3 hours typically).
If I needed more I would switch to 3000 mah AA's over the 2000 mah ones
I am using now.
Gerbings heating pattern (as mentioned before, top of hands and fingers only),
leaves a bit to be desired because the thumbs aren't heated. I didn't notice
the thumbs were unheated at first, but after some cold rides it has become a sore
thumb.
Everything else is great.