I've got a full set on my Apeks ATX200 Black Pearl. Changed the BC whip, the primary and the octo over on to MiFlex hoses, so the only rubber hose is the SPG.
The MiFlex hoses are much lighter than the rubber equivalent, and are far more flexible no resistance at all when you move your head around, etc. Rebreather divers love 'em as they are easy to shape through the casing, much better than rubber ones. You can even tie them in a knot and they still work fine.
More expensive, but we'll see how long they last. Done nearly 100 dives on them and they still look good as new. I have black on the primary, blue for the BCD and glow yellow for the octo.
The new Aqualung Mikron has a MiFlex hose fitted as standard on the primary reg, and two other major manufacturers have apparently expressed an interest in using them as well, so be interesting to see how many other follow suit.
Mark