I chose the charger because it has excellent monitoring and control on-board. I read the data sheet for the Texas Instruments charge controller and it had the needed protection for the unprotected batteries (under-voltage, over-voltage), with the over-current protection provided by a simple fast-blow fuse.
The only issue is that the charger only runs at 1.5 A max current. Considering that the battery array is capable of taking more than four times that rate, is there going to be an issue charging so slowly?
I've seen Sparkfun recommend this charger for their 3.7 V Li-po pack that uses three 18650 cells, so I figured it would be fine and just charge very (very) slowly. If it's necessary, I suppose I could wire up two chargers and split the cells between them, but I don't mind the slow charging rate if it won't hurt the batteries.