From initial thoughts, it is much more clear than the 442. I've been running the sd mixer for over two years now and I've always liked the sound of the front end - pretty transparent, bust also based on Lundahl transformers. (mk/kc5/cmc>442>v3...)
The sound of the 744T is even more transparent but it also seems to warm over on the top end. In a 24bit enivronment this shaping is good especially if you have been listening to 24bit for a while - you'll certainly hear the difference of the accuracy on the higher ends because of this trend, instead of at times brittle audio that can be found within the 24bit world. Some may hear this as colorization, and in essence it is. But at large it enhances what is already a sensitive region of the sound spectrum.
I listen just about everything through monitors, and the open air of the sound leaves me gasping at what this little armored box can do.
Wayne nails it. I've taped Schoeps and B&Ks with the 744T. Your tapes will sound like the mics you put on it.