I have had the turbo on the truck for about 3500 miles now, with about 1525 of those miles towing, some hwy, fwy, and FS roads. About 1100 miles of empty fwy/hwy cruising and the rest is around town and FS roads. Here is my updated overall impression.
I still feel the turbo is superior to stock in every form. The hottest I have seen is still the ~1225° WOT in 6th at 1600 rpms with a trailer on a hill, and that was on SW1 on the SJR, SW3 peaks about 1190° as there is more boost from the increased exhaust flow.
DP is nearly always 1:1 or better. Empty cruise with EGT's below 900° its about 1-1. 5 psi higher than boost , and WOT acceleration above 2500 rpms will give about a 1. 2:1. Towing at constant rpms its right at 1:1 95% of the time. If the EGT's are at 1100° or above the drive pressure can get as low as . 8:1 on a grade (I have noted more than once 24-25 psi of boost with 20-22 psi of drive on a grade). This is one efficient turbo!
I have been running SW3 on the SJR and the EGT's reported here on on that setting (SW3 TM2 TQ2 PoD99. . uncorr 386/712 without any of the bolt on mods). EGT's are generally 600-800° in 1-4th gears, but can hit 1000° with a big hill and load. 5th and 6th gears run 700-900°cruiseing around here with the elevation changes, and big mountain passes will see approx 1050°max when empty and 8-12 psi of boost. If I had to pick the turbo's favorite EGT is would be 1000°, towing or empty that seems to be where the turbine starts to gets it's peak efficiency at, the EGT's will climb quick to near 1000° and then only slowly go up from there. When towing in 6th gear it runs between 900-1100° except on the biggest of hills where is will slowly climb to a peak of 1190°, I have yet to break 1200° except where noted earlier. If I drop to 60 in 5th it generally runs at about 800-1100° depending on the grade, but it takes over 70% load to get the EGT's above 1050°. I recently pulled rye-grass hill (I-90) at 50 in 5th at 7spi and 800° (was slowing for the u-haul following me) at about 15K GCW.
I think with my current power setting the turbo is well matched for the fuel, I am not sure I would get above my personal limits of 1250° continuous/1300° momentary above 2000 rpms in any gear, but especially 6th. Based on what I have seen I can probably pull just about any mountain pass (curves aside) in 6th up to 18K GCW and have the power/EGT's to do so.
Fuel Efficiency is really much harder to quantify an increase/decrease than most want to think, but I would say that I have seen about a 10% increase in cruise economy, and probably 5% in slow speed towing. I recently got an average of just above 14 towing a 7x16' enclose trailer at an estimated 15K GCW from Bozeman to Seattle, normal flats speeds were 65 and hills were 45-60 depending on curves. Then returning from Seattle to Boise I got right around 19 (had some mixed towing but the math points to 19 flat on the last 500 miles), with a bed full of furniture and appliances at an average speed of 66, my previous best on that trip with an empty bed was 17. 25 with more timing.
Towing or empty the IAT's seem to hold 6-10° (a/c off) and 9-12° (a/c on) above ambient unless pulling grades, then +30° is still the hottest I recall seeing at 25psi of boost. The compressor is very efficient.
Oil pressure is still holding a few psi higher than it ever was with the stock turbo and doesn't drop as much pulling grades, the higher oil flow thru the stock turbo must have heated the oil more than I thought.
Coolant temps seem to run a little cooler as well. I am not sure what is causing the lower coolant temps, if it's the lower drive pressure and thus better flow thru the cylinders so lower cylinder temps, or if it's from lower heat soak from the wrapped manifold/turbo, or what. . but I have yet to break 198° this year in the last 1525 miles of towing, and the thermostat isn't even fully open until 207°.
Attention: TDR Forum Junkies 
It could have been a custom setup he did for someone. What you say makes sense since the prices Tom quoted were close to or less than what other vendors were selling the same series of turbos for. 
