Interesting. I used a reissue flip top in Finland, courtesy of Mika from the Barnshakers. They had an awesome sound (Slingerland Radioking drums, old Fender amp for guitar, etc etc) and the bass sounded huge, warm, defined. Maybe it just a case of what works for some players/basses doesn't work at all for others. I loved the flip-top. If I had a roadie and a lazy 2 grand (in that order

) I'd buy one tomorrow.
I guess the moral of the story when choosing an amp is to try out as many as you can to find the one for you.