The problem with the little maufacturers is, that you need to send the amp/combo to them.
The Lundgaard amps seem to have a certain sound. You need to like it or better stay away from them. All the bass players on BASS2012 in Copenhagen played over the Lundgaard combo amps and personally I didn't like the sound.
There is another manufacturer in denmark making amps for electric and double bass:
http://www.cadaudio.dk/bassamps.htm
I once played two of their combo amps with my Clevinger EUB (when I was there for holidays just a few kilometers away) and they are nice and a lot cheaper than the Lundgaard ones. But they don't have them in stock and only build on request. If I haven't bought my Genz Benz Shuttle 3.0-10T, I might have bought one of these ones. One of the guys building it is a double bass player and knows what he wants from his amp. Since this is a two guy company mainly producing PA gear, expect some time until you can get it. I think you can give it back if you don't like it, but need to pay for the shipping.
BTW, I played the DB-510 (old version) and the DB500-210(T?). I liked the DB500-210(T) best for the EUB, but it's a bit larger and heavier than the DB510.
Was looking for something lighter and found a cheaper new GB Shuttle combo a few months later. Not the ultimate linear combo, but punches through very well and still sound good with my DB. They also make bass heads without a cab.
There is also the german Zadow combo amp, similar to the AI combos, but enhanced in several ways. A one person company with really good service. A bit closer to Italy than Denmark and you can test this amp too.
http://www.zadow-electronics.de/musik_e.htm
But for the amplifier only (no cab) the AI is probably a better choice (a bit more expensive but with more options), since this company seems to be a bit larger, so you can expect a longer existance of the company.