I'd recommend it. iOS 9.3.3 is expected to be the last major update before iOS 10 is released in a few months, so you might as well get on the latest and jailbreak while you still can.
The semi-untethered part isn't bad at all, especially considering all jailbreak apps / mods / settings / etc. remain intact.
I'm just glad Field Test is fullscreen on my 6+ again: