Howdy and Welcome,
I've been using a BUJO for over a year now, and I'm loving it. I prefer the ESSENTIALS book from Peter Pauper Press - over Moleskine, Rhodia, and composition notebooks. I have 2 sizes, A5 and the small size - both in grid format.
There has been no 'ghosting' for me - only a little bleed through with a Sharpie and a fountain pen when I wrote in one spot for too long (doing pen test).
I use (Pilot) Frixion pens and Frixion highlighters in my journals because they're erasable! No ghosting and no bleed through. I use washi tape on same pages, too!