No, I don't work on bands. I have great respect for those that do.
Until the supply of logs becomes restricted, or regulated as it is in much of Europe, the use of band saws will not replace the circle saw in the foreseeable future. Why cut big board feet in a hurry, only to run out of logs by Tuesday? As it was pointed out, smaller band mills tend to lack in production capability. But if you aren't getting a lot of logs....
The use of band resaws as an augment to the circle head rig seems to be the configuration most larger operations are moving toward. You don't need as big and expensive a band rig to resaw, and the inevitable wrecks on initial break down to the cant are easier to handle on a circle head rig. Recovery there isn't an issue. Your throwing the slabs away anyhow. It represents a big capitol outlay, and increased employees to tend the bands, but the increase in recovery, and production offset the costs, if you have the volume.
Practically speaking, it has been my experience that folks that have not had much experience around a mill are probably better off getting started on a little band rig. They are turnkey, and the manufacturers seem to provide support. If you don't know what you are doing on a circle rig, you are in trouble. The problems with a band set up seem easier to solve. And when things go wrong, they usually don't blame the saw Doctor.