I just built this, and frankly, the only thing I really wish it had is LED's to indicate the polarity of the CV input.
Agree and I have one and prefer my Intellijel and Erogeneous Tones VCAs at least they have LEDs for polarity and activity with CV inputs.
I looked at the Erogenous Tones, but I couldn't pass up the cost on the Hex. I also have the Intellijel. I think I'm going to end up with an assortment. I just ordered a dual Doepfer to dedicate next to my VCO bank.
I scored a deal on the VC8 Erogeneous Tones and Radar so figure perfect for my 14u MDLR case. Hex VCA and Intellijel are fine choices and I have those in my other cases. I find that better to have more VCA and support tools and modulation sources than to be without.