I would not by a IS BT Max.... I have the first year model with about 20k miles on it(bought it when I picked up my '98 RT). Here it is in a nutshell:
Nice flip up design
I like the internal sun shield and the slider to actuate it.
Built in speaker pockets in the foam.
Removable liner to wash it and clean up.
And now the BAD:
The helmet developed a internal rattle that will drive you nuts. The first time I heard the rattle when it was under warranty yet. Had the dealer send it in at end of riding season. Got it back rattle free.This lasted about 3 months.Well the rattle is back. You don't hear it all the time,just when the right combo of the inner sun and outer shields are "met". I have tightened every fastener I can find to no avail...
It has been a good helmet,but I would be buying another one...Maybe a Nolan 104 the next time around.
Just my 2cents worth.