Jets are a negative fin, so they tend to make your feet sink. With a dry suit, that's lovely, because dry suit divers tend more to have floaty feet. In a wetsuit, that can be a minor issue, requiring that you take some of your required ballast and put it higher on your body. If you aren't using any exposure protection and have little or no ballast, that's a problem, but if you are wearing at least a 3 mil wetsuit, you probably need enough lead that you can move it around.
If you are thinking of buying a backplate setup with an eye toward doubles in the future, I highly recommend you consider one for your wife as well. You won't hear that from your LDS, because most likely they don't carry them. But there are great things about backplate and harness systems for women -- there is no chest strap, so nothing uncomfortable in the front. There are no great big pockets for which a short woman doesn't have torso length. The size is infinitely adjustable so that everything fits as it ought. If the diver is narrow across the shoulders, the harness can be crossed behind the neck, so the straps will stay perfectly put. Your LDS is going to try to sell padding, and pink, and pockets; I can tell you from personal experience that none of those things will make diving fun, if the BC doesn't fit well enough to be comfortable, and hold the dratted tank stable in the middle of her back.
We're just in the process of certifying a young woman. She did a shop jacket BC on the first day, a back-inflate BC of her mother's on the second, and one of our backplates on the third. Guess what she's irritating the stink out of her mother by insisting on buying?