When bonk3 was coming out I was 10, and asked my parents for it because I loved the first two so much, and they ended up getting me super bonk. I lined over bonk 3 in magazines, but never did get a copy. I played the shit out of Super Bonk but the form changes sucked, level design was so different, and I generally did not like it as much as I did the first two. Perhaps it lacks the same charm.
I recently picked up the Japan only exclusive sequel Super Bonk 2, and it was even stranger. I might spend some more time with it soon, but think I'd rather give the third Turbob version a playthrough first.