Does it roll true? - Absolutely. You can tell a difference in speed based on the grain. I have the CC model - 10 stimp one way 11 the other. You can absolutely tell when you are hitting on the faster side (apparently my knowledge of stimp is way off as the 11 is lightening fast. Way faster than my CC when they say we are near 11). Rolls just as true rolling either direction or even cross grain.
How does it do on carpet? - unsure. I have it on a cement floor and have not tried on carpet. My guess is the material will not be heavy enough to sit still on carpet and you will notice significantly while walking on it.
Also is the 4’ width enough? - For me it is perfect. I have the 1/2 inch thickness model and get to play all sort of fun putts because I just stand off the edge of the mat and use angles that way without having a funky stance.
Also did you get the edging all the way around? - got the horseshoe style. 3 feet on each side and the back. With the edging you will not be able to play shots when you are standing off the mat that well. Having the edging in the middle of the mat wont do anything for you.
It is super easy to move around - bringing it out by the pool will be no problem.
The material is VERY light. Think yoga mat and subtract half the weight. For me, this is great because I have it on a cement floor with “character” (100 year old house), so I get to move it around and play all sort of interesting breaks that are natural to the ground. It lays flat very quickly.
The material is damage prone. I have a dog that likes to play with golf balls and he is an absolute terror to my mat. His nails dig in and leave permanent marks. They are small and don’t really impact the roll, but with enough of them it’ll be dangerous. If you slammed the back of your putter on it, 50/50 chance it would rip. If you use it for its intent, these issues won’t occur.
The half inch thickness cups doesn’t catch all the balls you hit at it and has some unbelievably aggressive lip outs. You know when it goes in, however.
Lastly, it catches a lot of dirt/dust/other from the air. I use a broom and it comes right off no problem.
Best putting mat I have ever used.