My big regret is not getting a traditional octopus...not only does my hand brush the purge button and waste air when I use the deflator on my integrated Air XS 2 but I have to take the regulator out of my mouth and give it to my dive buddy to share air and then switch to my secondary reg since the hose is so much shorter instead of just nodding and letting my dive buddy grab the secondary that would be hooked to my sternum strap. Extra hose? Fine, I'll deal with the extra "hassle" to not have to take my air source out of my mouth when my buddy needs air.
Actually, not only do I regret not getting a traditional octopus, but in retrospect, I would have bought a completely different set of gear...although it would have been more expensive, so the BCD setup may have been the same. I would have gotten a wrist computer, probably a VEO-250NX instead of console VEO-100NX, kept the Oceanic air gauge and for compass just gotten a wrist one so I'd have my dive computer on my left wrist and compass on my right wrist, and I'd have my air gauge clipped to my sternum strap as well so I can just glance down to look at my air consumption.
Would have bought the same fins, mask, booties, maybe a different wetsuit since the rolled neck on the Pinnacle suits are a pain in the ass, same hooded vest, same regulator....yep, think that's about all I'd change is get a traditional octopus and different setup for gauges and computer.
So yeah if you haven't bought your own gear yet and are in your OW class, listen to your instructor as I failed to do so, and rent some gear and try out different configs before you buy any expensive gear.
Although I'm leaving my console as is and getting a VEO-250NX wrist computer, so I guess I'll have redundancy at least since I'll be diving with two computers. *shrugs*