If you know what you're doing, the new semi-tethered is almost as good as an untethered jailbreak. If you turn the phone off or reboot, it will come back and you will still be able to use all your apps, make calls, receive texts, etc.
I believe the only things you cannot use are Mobile Safari and Mail apps, and jailbreak tweaks. However, I installed Atomic Browser from the app store, and that you can still use, to browse the web and check your mail through the web browser. Also, any app that lets you check your email in the app store will also work. When you get home, you boot tethered and all jailbreak stuff is good to go again. You mostly only lose your jailbreak until you have cpu access.
Basically, you are not left without a working phone in the rare case of powering down, rebooting while on the go which is the big worry with tethered.
An untethered is preferred of course, but semi-tethered is much closer to untethered than tethered, and should convince those on the fence IMO.