The foam makes all the difference.  With other goggles I either get a headache from straps which need to be very tight, a sore between my eyes, above my nose where some press in, or indentations which we call raccoon eyes.
And being able to adjust the nose piece is a plus as is the fact that you can get all the parts at a later date when they wear out.
My husband has been using his twice a week for over 12 years, just replacing the parts available when necessary. His are the original round ones, I prefer the B300.

Barracuda goggles B300 provide exceptional quality and comfort for fitness swimming. The foam around the eyecups seals without pressure, and the nose bridge can be custom fitted to any size. Plus, these goggles last for years. I have been lap swimming and loving swimming since the mid 80''s and I wouldn''t use any other goggle!

I swim two -three miles a week. I had read other reviews from distance swimmers about how great and comfortable  these goggles were swimming long distances. I wish i had just stuck to my tried and true goggles- these overrated and expensive goggles leaked no matter what I did. I had to tighten them so much to try (yes-try) to get the leak stopped that they became uncomfortable. I will not buy these again.

B300 lens redesign is horrible. I loved the fit of the B300 but the new lens design really cuts down on visibility. Wore once probably won''t again.
Leave it for emergency back up at best.

These are really comfortable.  They don''t leak. But the biggest thing is that I don''t have google rings around my eyes all day.

fits great