Like many, Jacks are tricky, yet they are my favourite and I am often luckier with JJ then KK or AA! But UTG it does cause concern and I guess it depends on the situation, my opponents, the game level, etc. Definitely shove if low chips in tourney, always raise - I'd never just call them I don't think unless I suspect loose/agg on my left who will always reraise so I just let them do it for me, tricky position, I guess it just depends is the answer 🙂