I had the choice between the AutoLogic and the one from SA. The dealer advised to go auto logic. I took his advice and am happy with the result.
I was at the Sydney LRO club day at Graeme Cooper and the AutoLogic aquited itself well. It was however piped by the SA one. However the AutoLogic did win the produced the most "smoke" when at full reves.
I believe there was about 5% better preformace from the SA chip up graded Defenders and disco's.
CG's comment was and he sells neither upgrade (at the time) was that the autologic unit probably was better tuned to the UK climate and hence the smoke issue??
I think the SA unit I refer to is the forum supplier/supporter so I would say if going again (and I might) I'd go that way given what I've seen and read.

