I know this is an old thread, but I did not want to start a new for for this.
I am sold on the Fantastic Vent after reading many testimonials and great stuff about their customer service, but I also like some aspects of this Maxxfan and was looking for more feedback.
John of SMB West told me that putting a full size vent on the penthouse roof would void the lifetime warranty on the roof. I insisted as having a roof vent and still having the warranty as a condition for the sale. He came up with this little 6 inch fan/vent that works great. It doesn't look like much but it works almost as good as the big vents. I've attached a picture.
Check with SMB to see if they've have to do the install to keep the warranty intact.
I bought one and it looks ok. But I decided to stick with my Fantastic Vent standalone fan.
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