TOTL Headphone Amps

Not a TOTL amp, but I saw the DARKVOICE 336SE OTL HEADPHONE AMP on MassDrop and looks very interesting. Never seen an OTL headphone amp before and I’m intrigued, especially at $200. Any thoughts?

Three noteworthy amps, from my experience:

Benchmark HPA4 - maximum transparency and detail, clinical in its precision 

Ampsandsound Bigger Ben - incredible musicality, a touch of warmth, lots of power

JDS Labs EL II - All-around solid performer at a budget price of $250

The Darkvoice 336SE OTL amp would be an interesting choice, haven't heard it but I imagine it'll have a distinct sound: alas, I've heard about quality control issues.

Wa33 Elite by woo audio

WA33 is probably the best tube-based option. If your preferences run Solid State I'd consider the HeadAmp GS-X mk2, and if aesthetics don't matter to you, the Audio-GD Master 9.

The best deal out there on an excellent OTL (David Berring’s ZOTL design) is the $1250 Linear Tube Audio ZOTL. I actually have David’s prototype of this amp that is so good that it can also be used as a preamp in a very high end system! Also as an amp for very high efficiency speakers. Natural, smooth clear.