I have owned most every type of passive device. In my opinion, a TVC is the warmest of all. I wouldn’t say it has more body, but definitely a warmer sound while still retaining the transparency of a passive. TVCs aren’t quite as transparent as an LDR or resistor based passive.
The Hattor is the first resistor passive I have liked. Mine has the AMRT resistors from AMT Trans. Similar to the AMRG but according to Arek, even better. I am pairing it with an Aric Super 300B amplifier and the result is to my liking. I feel like I get all the goodness of the 300B tube with incredible transparency.
The Hattor Audio Big passive is a stone cold bargain IMHO.