I just watched Busardo's Erlk vid he did at the end of July. He wasn't particularly enamored with it. Gave it a thumbs up on vape quality but kinda hammered it alot on useability features and price. They are freaking expensive. Ridiculously expensive unless their pricing has changed recently. Haven't followed the Erlk since shortly after Q started his thread.
The Erlkonigin is EUR 107 and the ErlPrinz is EUR 33.. after the VAT is taken off. For a 3rd of the price, the Prinz incorporates some of the better features, and is a beautifully made SS topper. The fasttech clone was $20 in comparison. I like the SS on the Prinz. Goes better with what I have and use, and I also bought the Nano tank, because I intend to use it on my pipes with the higher VG juices I have. The air-flow on this thing via the 2mm air intake is phenomenal.
I'd wait to see if they are made available in the U.S, just to get away from the ridiculous shipping, although who would carry them, I don't know. VapeRev perhaps?!