No reason they wouldn't work as well as any other 75 ohm video cable. Mogami is a fairly respected manufacturer of cables in Japan, much as Belden is here.
Im using them and am very impressed. I replaced my 1000mv series monster cables with these and I see NO difference. Im using the 6ft mogami with a front projector setup.
They are extremely flexible unlike Belden and the connectors are tight fitting and well soldered. The build quality is topnotch...The only downside I could possibly pointout is the cable diameter is very small. This may cause shielding issues if used in lengths longer than 10ft...
Overall, I will never purchase another overpriced boutique/mass-marketed cable.