Thanks for the replies. Pretty much what I was expecting in terms of feedback. I figured the safety issue was the biggest thing.

I am kinda looking around for a spare/passenger helmet right now at around the $100 mark. I have found some nice HJC CL-SPs and the like on newenough.com also.

I have a Shoei RF1000 and I really don't mind it, as I said, I just wanted some insight from others re: modular lids if they had any experience with them.