i had a johnson millenium stereo 250 for over 5 years. it was a fantastic amp, i got some really killer tones from it at the time. i loved the floorboard, it made me feel like a rockstar when i was a teenager haha, it was a nice amp and good used buy. the leads and cleans are very nice for a solid state/digital amp. i use a jstation now when i practice and cut my demos and song ideas, and i still think the crunch and clean tones are better than any pod to date, just do a little tweakin and your in business.
and your right johnson was just a division of digitech. it actually said digitech on the back of my amp. the interface is almost identical to a 2112 preamp.