The Blueant definately has a short distance and you would loose contact if separated by traffic so it might or might not work but as far as CB goes ( and I have an 08 Ultra Classic with CB and all the goodies) where I live you can't talk without getting stepped on or bled over by more powerful stations close by to you and they are noisy and just IMO leave a lot to be desired. I use my blueant for driver to passenger for the most part and if I was seriously going to have a need for Bike to Bike communications, I would probably go with a Chatterbox GMRS setup that is expensive, requires a license and would be clearer and more reliable than cb radio. However, as in most cases with cost being a factor, CB is probably the cheapest alternative and will do the job.
** This is based on my experience and I am an Amateur Radio Operator and tech and I have a lot of choices in frequencies to talk on:swoon**