My my... I think the proper response is Great Job.
600+ on diesel only is a great number. 800+ is even better I don't care how you get it.
When the race is over, what you run doesn't matter. Who gets the win light does. :-laf
Jeff makes 550+ with a single on his 12v street truck. I was impressed, weren't you Preston?

(sorry had to dig)
Every other characteristic is subjective. I personally HATE lag. But my level of acceptance is lower than most. A quick spooling truck to some may not be to me. Again, very subjective.
I have now tested a few HT turbo's. GREAT spool. These had small exhaust housings so the upper end was not as strong, but still great turbos from what I have seen so far. Both nearly hit 500hp, made good boost, and I was making nearly identical boost numbers on the dyno as the owners were seeing on the street. (45-47 psi)
I agree with Mark, sizing twins is a big issue then the subsequent tuning too. I'm not gonna pretend to be the expert, I just know someone that is. Good enough for me.
Great Job Lenny on the 800 club.