For tree fiddy and a cookie, how bad could it be? Actually, I don't think I would ever buy the ES-1 because I am not prone to buying into known problems.
I am in the excellent position of having Naaman's BH, the WES, and my own 007t and SRD-7 Pro to check out with the Omega/4070/Lambda Sigs, so I will be happily comparing them once I reconstruct the rig. I am guessing the BH will be great, but other than listening for a minute just to make sure the Omegas worked I have not heard that combo. The BH was great with the 4070s and Lambdas, so that is two checks in the yes column.
And I am very much looking forward to a full report. The KG comments I saw before were pretty minimal and mostly said that they tested very similarly. I need a more emotional review than that.