I did the Blackberry Merlot as my very second kit. I did not filter it, but racked it an extra time when it said to bottle. I then waited another week before bottling and it was extremely clear. I personally see no need to filter this kit.
BTW, I haven't heard anything more from George about the wine club, but I'm still working on it.
If you want to PM me with your e-mail address and/or phone number I'll contact you when I find out more.