I can summarize all the preceding threads:
Some people love the simplicity / awesome analog sound / found the right pairing.
Others dislike the lack of screen / pickiness of pairing/ price.
Some others are just haters and should shut up.
Charles designed a wonderful object and is a bit of an original in terms of communication, not always for the best. His price hikes seems random and ridiculous but he forces no one to buy.
The Tera pairs very well with some high impedance BA such as the SE5, some dynamic drivers within the FAD range or other brands, and some hybrids such as Tralucent.
It does NOT pair well with most low impedance multi BA, depending on their impedance curve, as the output caps might entail major bass cut off. Miracles and K3003 are to be avoided. And in general an impedance adapter does not help as it just adds impedance into the chain.
The random function does not work well and the algorithm can be improved by sending it back to Charles (who will also improve other minor stuff for free).
I love my stealth Tera and it helps me get all the girls (even though my stunning looks do help).
musicday loves his Tera A LOT and would marry it given the legal possibility.
The Tera is not perfect but has great qualities and still hold his own today vs. the top DAPs.
Everytime I listen to my Tera-Player, I say "WOW!" all over again!