Ok, so i'll turn the question around to you: what info do the "supposed" experts on PGA have to quantify that it is a shit box?
I don't have any info to quantify that it is a good or a bad gearbox. To me it's not bad, but lack of a good mechanical lsd does not do it any favours either. I don't think the spacing between the ratios is bad either.
Chris said what he did for a reason: the honda motors he has been building are meant to stay in a high rpm band when you are going flat out; this is because they make their peak torque at a high rpm. As a consequence, Honda gear them as such to do this.
My brother's old DC2 Integra Type R is case in point. I used to shift just shy of 8,900 rpm to keep it on the boil.
There will be a limit where you start making a lot of torque (ie in a turbo setup), and you will start breaking components.
Look at Lgee's U13 as a prime example, lots of torque, and he has shredded 3rd gear many a time; because it was the weakest link in the chain.
There have been past members that did SR swaps into the u12 and used the 32 / 70 series pulsar boxes, and they used to shit gearsets even thinking about jumping on the loud pedal. BruceTI's blue TRX (SIRTRX's old car) had this problem, and he was only pushing 200ish kw at the wheels through it.
AFAIK, Kranz has not had that issue with his hybrid 50 series box at all.
Compared to something like, a Hollinger or Xtrac sequential 6 speed, simply there is no comparison. Hollinger or Xtrac hands down, because they are dedicated race boxes.
I'll say it again: Apart from installing a good mechancial or clutch pack type LSD, stuffing around with gearboxes in the U12 is going to be a waste of money, money that could otherwise be spent on making more power.