I exclusively use Netscape and have only seen a problem with the registry page, colors for the hot links were the same color as the back ground. If I start to see problems and you decide to only support MSIE then I will have to stop using the site. I use very few MS products and even then they cause me far more loss of productivity than they are worth. The never ending crashes and rebooting the PC on a daily basis is counter productive. I haven't rebooted my Sun machine in over 6 months and then that was to install a new version of the OS. In my work environment MS doesn't mean MicroSoft, it means Mostly Shit. The only real operating system is Solaris by Sun Microsystems. Anyway, so far the site is viewable with Netscape.
I run both NS and IE on a200 MHZ Mac clone, running Apple OS 8.1. What I gather is 'single pixel' backgroundloading on this site causes incredibly slow page loads with NS, but is no problem at all with IE. I also have major page loading hangups all the time on the CF with NS, and relatively few with IE. I guess the choice is becoming clear.
My only concern is that I really like the NS e-mail and newsgroup structure and have no idea what it's like with IE. I think I've read that I'll need an e-mail client with IE and have to be sure I'll be able to transfer all my stored e-mails from NS.