Fantastic boots. I have a few pairs of Tretorns, including the boots that preceded these (the Walden). They're very similar, but Tretorn has improved them quite a bit in the past few years.
First, they are quality made with great leather, a warm flannel lining, and the insoles and sole are incredibly comfortable. They took a few hours to break in, but after that, they are fantastic. I've worn them nonstop for the past few weeks, and they've been really comfortable and warm.
One problem I had with the Waldens was the lack of durability. After wearing them several times, the sole started to wear through to the midsole, they lost a lot of shape, and just felt floppy. Not so with the Holdyn, they have held up extremely well, the leather is stiff and thick, and the sole is thicker and much more durable.
As most of you have probably seen on the news, the Atlanta winter has been pretty crazy this year. These have been perfect for the cold, ice and snow. First, they are really warm. Not like snow boots, but my toes are nice and toasty in 20 degree weather with a pair of wool socks. Second, they have great grip. I slide all over the place in tennis shoes or Vans, but these grip really well on ice and snow. Very impressed. Last, they are treated with some sort of DWR, and the seams are sealed well apparently, because I haven't had water in them at all when walking in several inches of snow and slush.
Overall, incredibly impressed with these boots, with the only complaint being they run big. Like a whole size big. I like my shoes to fit snug, and these don't. Not a huge deal because they are boots, so bulky is ok, and I wear thick socks, but Tretorn shoes seem to run big as a company, so no surprise, I was just hoping they wouldn't.