I ordered an Ampeg Portabass from a webshop here in Norway (250W amp, 2x10 speakers).  I wouldn't normally have bought an amp without testing it first, but it was a weekend offer and they were selling it at half price.  
Anyway, I wasn't happy with it, it colored the sound too much and I felt it didn't let the Alembic sound through.
There was also too little bottom end. Anything below C on the A string was to weak.  Might have something to do with the sealed box construction.
It was extremely lightweight though, almost as if they had sent me an empty box. :-)
So I sent it back and got an SWR Workingman's 15 instead. And I'm much happier with that.  It's a lot heavier, but I manage.  It obviously cannot compete with some of the high end gear mentioned in above posts, but I like it a lot.  It gives a nice, full sound that suits the Alembic well.  And powerwise it's an overkill in the band I play now, I only use it for stage sound and we're playing an acoustic type of music.  But it's nice to have that 15 speaker for the bottom end.