I am not normally a bibtight wearer, preferring to wear PI or LG tights over my bike shorts in cooler weather. However, I was looking for something that would keep me warm in upper 20's and lower 30's, and one of my friends who lives in Colorado recommended these -- and I figured he would know. I have used them a couple of times in low-30 temps, and found them warm enough. While my friend said he'd worn them in the lower 20's, I don't think that would have worked for me, but he's younger and probably generates more heat than I do! However, the Sportful Total Comfort Bibtight is (at least) a very good 4-star product, and they are quite comfortable as well although they are a bit on the pricey side.
This is my first Sportful product. It was a reasonable price. I wanted to replace my old sweat-bucket windbreaker. At first I was worried about the vents on the back near the arms. I thought they would cause problems, but they didn't. They might in the rain, but I bought this to be a windbreaker only. The jacket is quiet, except for the 25-40 mph wind I had to endure on one ride. I am 5'4" 118 lbs and have the slze S, which leaves me ample room for underlayers.
I bought these bibs as my previous "entry level" pair had tendency to ride up and bunch around the groin after 20 or 30 miles and the shoulder straps always rolled up. No such problems with the Sportful Supergiara Bibs. The fit definitely runs small (I am 5'-10", 190 lbs and the XL is snug), but I followed Sportful's guidance and the performance has been great. I wore these bibs on a 60 mile ride a couple of days after they arrived and had zero discomfort the whole ride. The left leg pocket was useful to stash bar wrappers in and I used the back pockets to stash my phone, wallet, and a couple snacks. The material is a little different than the typical lycra I am familiar as it is more rugged with less stretch, but the resulting compression helped keep things supported on a long ride. Lastly, I am much happier with the shoulder straps on these bibs than other brands that are using very flimsy materials. I would recommend these to anyone in the market for a new pair of cargo bibs.