The shootout of the portables:
Gigabomber's comments on these will be much more detailed I think... he's the comparison king today, notepad and all.
Listening to the three myself with SA5000s (one of the 3 pairs here!), I found the SMv3 w/ OPA627 most pleasing, but I own it, so I'm biased.
I found Zemo's Lambda and the SR-71 quite close to each other actually, with the SM having more subdued treble that those two and a more "round" sound (fuller to some people), which I personally like with the SA5000. The signature balance of the Lambda and the SR-71 is a little different, but the overall feel is almost identical to me. Considering the Lambda is less than half the price of the SR-71 I think it would be an outsanding substitute for those looking at Ray's amp.
Late Edit to clear up a question: the SM had OPA627 op amps, while the Lambda is AD based. Many have speculated, and I agree after listening compared with other AD based amps, that the SR-71 is AD based as well. This may be the source of most of the similarities/differences we heard. I hope to get a chance to swap in my AD8610s, or maybe some Class A forced AD op amps like Xin is pushing now, into the SM and listen again some time. It would most certainly change the results, though how I'm not sure.