regarding reversibles there are two common regulator configurations. One has the left hose come up and around the neck and the long hose loop around the chest and the hoses look and behave like those for backmount doubles. This is how Edd Sorensor and his instructors teach as well as the Razor/xDeep crowd. The other common one is to have the left side reversed and comes straight up to the mouth, right side is normal and comes straight up to the mouth. Pros and cons. If you have Apeks XTX, Dive Rite XT, or Poseidons it is a nonissue, with Hog you have to ask to get the reversible Zeniths, and you have to make sure not to lose parts *I sent emails of how the XTX reverses to Jack this summer, he had never seen the XTX and didn't know how the reversing mechanism works, not a particularly comforting model for competitive analysis right there, but it's 100% idiotic they don't have something out like the XT or XTX that is reversible, there's really no excuse for it at this point*.
If you are choosing right now I wouldn't place tremendous merit on having the ability to reverse, but it is very convenient for left mounted stage/deco bottles, and I prefer them for the left side short hose since I don't like hoses wrapping around my body. With the price of the Hog's right now, just grab them and if you decide you really need the reversing regulators, then you can relegate the Hog second stages to stage bottles, and get different ones for backgas, doesn't really matter. If you are planning on taking cave, talk to your instructor, if you're planning on taking cave in sidemount in the US, call Cave Adventurers and buy from them, they will mak sure you are taken care of.
