I couldn't be happier with these. The build quality is really good, they are comfortable, and have a good pad. Perhaps to some extent I'm benefiting as much from finally upgrading from padded cycling shorts to bibs, but these are fantastic.
Im 511 and a big Clydesdale at 275 (started cycling at 335 lbs); still working off a big belly so I was wearing a sleeveless t-shirt under my jerseys because the jerseys would leave some belly hanging out (I know, I know, not pretty). With these bibs Im covered up until about my navel so I can finally lose the t-shirt/jersey combo and just rock the jersey which is much cooler for airflow and wicking. For what its worth I wear a Pearl Izumi Attack line jersey which is a bit roomier for a big rider. I wear a pair of Under Armour exercise shorts over the bibs because Im not comfortable yet just wearing the bibs.
My measurements are 511, 40 waist, 50" chest, and a short inseam of about 29. I have the XXXL size.