“TAD” Tubes

Anyone have experience with TAD Tubes.            ( Especially  the “remake” of the GE 6550 ) ?
Ag insider logo xs@2xwilliampowell
I've never heard of "TAD" tubes. Could you possibly mean "E.A.T."?
These guys have been advertising in guitar magazines seemingly forever.
Yes this is the manufacturer. Anyone tried their tubes of know more about them?
I tried their EL34 and straight from the box liked them better than Gold Lions. 
I use their EL84-STR in my Decware SE84UFO. Nice improvement over the stock tubes and new Mullards I tried.
I'm using the EL84-STR in my Grommes PHI-26, nice rich sound good highs without bloated bass.
How about their 6550 “GE”?