I agree that ESS isn't for everyone - sometimes it just a chip specific thing. For instance, some people find AKM velvet sound chips too mellow regardless of the implementation.
My setup now includes a Holo audio dac which is my end dac - really like it.
However, I did consider some other R2R Dacs including those from Audio-GD, who have brought many R2Rs to market and are fans of Burr Brown.
Website: http://audio-gd.com/Products-EN.htm
Not everyone's cup of tea but perhaps worth some research since their price point is certainly reasonable.