Thanks for the feedback. There doesn't seem to be any good valid reason to "risk" updating my current version of BC. In fact, it's probably best left alone, it's working ok.
If my PC crashes or I experience problems with BC, I'll look at it again then.
When speaking to Garmin, I asked what is the purpose of the update. They replied, "if I was experiencing problems using BC, they couldn't support my version anymore."
It sounds a bit like the Garmin Express updates, when Garmin release a new version of GE, how many times do they update it to get it to work right.