Integrex 30 or sqt lathe

I have been looking at sqt 18m and 18ms lathes. However an integrex 30 with c and y axis came abalone today I can get for a few thousand less. It has tailstock, y, c, and I think he said b axis with t plus.

What is b axis?

Is the integrex a good lathe and should I look for anything in particular? It is much more lathe than I need but if I ever needed the other options I would have them I'm thinking