I have never heard of them which means only the company has never been mentioned on TDR in my memory.
I suppose the first question that should be answered is what do you want? If you want a stock rebuild lots of transmission builders can do a good job. If you want a performance rebuild for long service life behind a Cummins engine towing heavy trailers the numbers of builders is drastically reduced.
DTT and Goerend are probably the two best and most familiar among TDR members. They are very good but pricey. Suncoast is another one some have mentioned. There is another brand but I will not name it.
James Northrum in Texas built mine in an '06 using DTT components. He is one of the good builders also.
If you want a transmission that will live behind high horsepower and torque and towing heavy loads, I have named several of the best. You can choose an installer near you using their parts. Be prepared to spend some money.