I have a Gnome Alpha II enlarger, set up with a condenser. It's a solid bit of kit but I wouls echo the above - it took me a while to work out why I always needed to burn in one side of my prints! It's quite easy to fix, though. Move the lamp housing down to it's lowest level, stop down to minimum aperture and wiggle it about until the 'light blob' is central. Move the lamp holder back up until light coverage appears even. I use mine when I want a bit more contrast out of MG papers as condensers give about 1/2 grade more. It will also take negs up to 6x9.

Have fun