I have a 04 ssb 6 speed, I have drove many manual trans from pickups, cars, old tractors, freightliner, eaton 10 speeds, 2 speed rearend needing to split every gear and 5 low then 4 high.
Clutch feel and how it shifts took a little getting used to but wouldn't have it any other way.
I drive many hours on interstate every week, between 8-12 hrs with cruise set and around 2,500 - 2,600 rpm most of the time, just hit 140,000 miles last week, this trans needs alittle more aggressive shifting than others, I have changed my oil twice both with royal purple, 1st time I drain I seen the shimmer in the oil, last time it was clean and looked like it was just put in.
This is the same nsg370 that is in the 6 speed jeep wranglers that they put in later after the crossfire, it holds up good in the wrangler and some tow with it, and wranglers has a higher tow rating.
When I researched the tow rating with the manual trans I found it had a tow rating of 3,300 lbs, don't remember exactly which site said that, but helps give a idea of capacity of transmission, if not for the flex discs in driveshafts it would probably have a higher rating.
I shift around 3,500, unless I want more acceleration or want to hear my dual exhaust, I think it had a great tone.
But last 100,000 miles the silverfox spends 80% of the time at 2,500 or more she runs great, took getting used to the higher review engines, but the alusil coated cylinders is to keep from cylinder wear.