I wear these pretty much everyday for work in a variety of colours. Some shrink more on first couple of washes than others - mainly in the body length but they are actually lasting pretty well for the money, no worse than most other t-shirts. The dark colours navy, black and dark grey have been least shrinking IME versus the lighter ones.

Yes.

I use these pretty much every day (T-shirt Printer) and make my own tops also. I do prefer the 'Heavy' Version to the 'Ultra' but they are almost the same. Pre-shrunk to 30-40 degrees so unless you are boiling them or putting them in the tumble they keep their shape and sizing.

I wear Gildan T-shirts every day of my life haha, they are good quality and well worth the price in my opinion.

After washing a couple of times, I found the following:

1. Irregular colour change in places.
2. Fraying in high stress zones, e.g. seams
3. Shrinking after third wash.

I'd say primary are better quality. Even the M&S ones are better in my opinion..

The above factors would indicate poor quality material. But I'll let you all be the judges of this. They are cheap enough to try and if they do perish, simply chuck them and get another..

With kindest regards...